Module java.base
Package java.util

Class Arrays

java.lang.Object
java.util.Arrays

public class Arrays
extends Object
This class contains various methods for manipulating arrays (such as sorting and searching). This class also contains a static factory that allows arrays to be viewed as lists.

The methods in this class all throw a NullPointerException, if the specified array reference is null, except where noted.

The documentation for the methods contained in this class includes brief descriptions of the implementations. Such descriptions should be regarded as implementation notes, rather than parts of the specification. Implementors should feel free to substitute other algorithms, so long as the specification itself is adhered to. (For example, the algorithm used by sort(Object[]) does not have to be a MergeSort, but it does have to be stable.)

This class is a member of the Java Collections Framework.

Since:
1.2
  • Method Summary

    Modifier and Type Method Description
    static <T> List<T> asList​(T... a)
    Returns a fixed-size list backed by the specified array.
    static int binarySearch​(byte[] a, byte key)
    Searches the specified array of bytes for the specified value using the binary search algorithm.
    static int binarySearch​(byte[] a, int fromIndex, int toIndex, byte key)
    Searches a range of the specified array of bytes for the specified value using the binary search algorithm.
    static int binarySearch​(char[] a, char key)
    Searches the specified array of chars for the specified value using the binary search algorithm.
    static int binarySearch​(char[] a, int fromIndex, int toIndex, char key)
    Searches a range of the specified array of chars for the specified value using the binary search algorithm.
    static int binarySearch​(double[] a, double key)
    Searches the specified array of doubles for the specified value using the binary search algorithm.
    static int binarySearch​(double[] a, int fromIndex, int toIndex, double key)
    Searches a range of the specified array of doubles for the specified value using the binary search algorithm.
    static int binarySearch​(float[] a, float key)
    Searches the specified array of floats for the specified value using the binary search algorithm.
    static int binarySearch​(float[] a, int fromIndex, int toIndex, float key)
    Searches a range of the specified array of floats for the specified value using the binary search algorithm.
    static int binarySearch​(int[] a, int key)
    Searches the specified array of ints for the specified value using the binary search algorithm.
    static int binarySearch​(int[] a, int fromIndex, int toIndex, int key)
    Searches a range of the specified array of ints for the specified value using the binary search algorithm.
    static int binarySearch​(long[] a, int fromIndex, int toIndex, long key)
    Searches a range of the specified array of longs for the specified value using the binary search algorithm.
    static int binarySearch​(long[] a, long key)
    Searches the specified array of longs for the specified value using the binary search algorithm.
    static int binarySearch​(short[] a, int fromIndex, int toIndex, short key)
    Searches a range of the specified array of shorts for the specified value using the binary search algorithm.
    static int binarySearch​(short[] a, short key)
    Searches the specified array of shorts for the specified value using the binary search algorithm.
    static int binarySearch​(Object[] a, int fromIndex, int toIndex, Object key)
    Searches a range of the specified array for the specified object using the binary search algorithm.
    static int binarySearch​(Object[] a, Object key)
    Searches the specified array for the specified object using the binary search algorithm.
    static <T> int binarySearch​(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c)
    Searches a range of the specified array for the specified object using the binary search algorithm.
    static <T> int binarySearch​(T[] a, T key, Comparator<? super T> c)
    Searches the specified array for the specified object using the binary search algorithm.
    static int compare​(boolean[] a, boolean[] b)
    Compares two boolean arrays lexicographically.
    static int compare​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
    Compares two boolean arrays lexicographically over the specified ranges.
    static int compare​(byte[] a, byte[] b)
    Compares two byte arrays lexicographically.
    static int compare​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
    Compares two byte arrays lexicographically over the specified ranges.
    static int compare​(char[] a, char[] b)
    Compares two char arrays lexicographically.
    static int compare​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
    Compares two char arrays lexicographically over the specified ranges.
    static int compare​(double[] a, double[] b)
    Compares two double arrays lexicographically.
    static int compare​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
    Compares two double arrays lexicographically over the specified ranges.
    static int compare​(float[] a, float[] b)
    Compares two float arrays lexicographically.
    static int compare​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
    Compares two float arrays lexicographically over the specified ranges.
    static int compare​(int[] a, int[] b)
    Compares two int arrays lexicographically.
    static int compare​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
    Compares two int arrays lexicographically over the specified ranges.
    static int compare​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
    Compares two long arrays lexicographically over the specified ranges.
    static int compare​(long[] a, long[] b)
    Compares two long arrays lexicographically.
    static int compare​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
    Compares two short arrays lexicographically over the specified ranges.
    static int compare​(short[] a, short[] b)
    Compares two short arrays lexicographically.
    static <T extends Comparable<? super T>>
    int
    compare​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex)
    Compares two Object arrays lexicographically over the specified ranges.
    static <T> int compare​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
    Compares two Object arrays lexicographically over the specified ranges.
    static <T extends Comparable<? super T>>
    int
    compare​(T[] a, T[] b)
    Compares two Object arrays, within comparable elements, lexicographically.
    static <T> int compare​(T[] a, T[] b, Comparator<? super T> cmp)
    Compares two Object arrays lexicographically using a specified comparator.
    static int compareUnsigned​(byte[] a, byte[] b)
    Compares two byte arrays lexicographically, numerically treating elements as unsigned.
    static int compareUnsigned​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
    Compares two byte arrays lexicographically over the specified ranges, numerically treating elements as unsigned.
    static int compareUnsigned​(int[] a, int[] b)
    Compares two int arrays lexicographically, numerically treating elements as unsigned.
    static int compareUnsigned​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
    Compares two int arrays lexicographically over the specified ranges, numerically treating elements as unsigned.
    static int compareUnsigned​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
    Compares two long arrays lexicographically over the specified ranges, numerically treating elements as unsigned.
    static int compareUnsigned​(long[] a, long[] b)
    Compares two long arrays lexicographically, numerically treating elements as unsigned.
    static int compareUnsigned​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
    Compares two short arrays lexicographically over the specified ranges, numerically treating elements as unsigned.
    static int compareUnsigned​(short[] a, short[] b)
    Compares two short arrays lexicographically, numerically treating elements as unsigned.
    static boolean[] copyOf​(boolean[] original, int newLength)
    Copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
    static byte[] copyOf​(byte[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static char[] copyOf​(char[] original, int newLength)
    Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length.
    static double[] copyOf​(double[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static float[] copyOf​(float[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static int[] copyOf​(int[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static long[] copyOf​(long[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static short[] copyOf​(short[] original, int newLength)
    Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
    static <T> T[] copyOf​(T[] original, int newLength)
    Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
    static <T,​ U> T[] copyOf​(U[] original, int newLength, Class<? extends T[]> newType)
    Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
    static boolean[] copyOfRange​(boolean[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static byte[] copyOfRange​(byte[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static char[] copyOfRange​(char[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static double[] copyOfRange​(double[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static float[] copyOfRange​(float[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static int[] copyOfRange​(int[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static long[] copyOfRange​(long[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static short[] copyOfRange​(short[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static <T> T[] copyOfRange​(T[] original, int from, int to)
    Copies the specified range of the specified array into a new array.
    static <T,​ U> T[] copyOfRange​(U[] original, int from, int to, Class<? extends T[]> newType)
    Copies the specified range of the specified array into a new array.
    static boolean deepEquals​(Object[] a1, Object[] a2)
    Returns true if the two specified arrays are deeply equal to one another.
    static int deepHashCode​(Object[] a)
    Returns a hash code based on the "deep contents" of the specified array.
    static String deepToString​(Object[] a)
    Returns a string representation of the "deep contents" of the specified array.
    static boolean equals​(boolean[] a, boolean[] a2)
    Returns true if the two specified arrays of booleans are equal to one another.
    static boolean equals​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of booleans, over the specified ranges, are equal to one another.
    static boolean equals​(byte[] a, byte[] a2)
    Returns true if the two specified arrays of bytes are equal to one another.
    static boolean equals​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of bytes, over the specified ranges, are equal to one another.
    static boolean equals​(char[] a, char[] a2)
    Returns true if the two specified arrays of chars are equal to one another.
    static boolean equals​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of chars, over the specified ranges, are equal to one another.
    static boolean equals​(double[] a, double[] a2)
    Returns true if the two specified arrays of doubles are equal to one another.
    static boolean equals​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of doubles, over the specified ranges, are equal to one another.
    static boolean equals​(float[] a, float[] a2)
    Returns true if the two specified arrays of floats are equal to one another.
    static boolean equals​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of floats, over the specified ranges, are equal to one another.
    static boolean equals​(int[] a, int[] a2)
    Returns true if the two specified arrays of ints are equal to one another.
    static boolean equals​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of ints, over the specified ranges, are equal to one another.
    static boolean equals​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of longs, over the specified ranges, are equal to one another.
    static boolean equals​(long[] a, long[] a2)
    Returns true if the two specified arrays of longs are equal to one another.
    static boolean equals​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of shorts, over the specified ranges, are equal to one another.
    static boolean equals​(short[] a, short[] a2)
    Returns true if the two specified arrays of shorts are equal to one another.
    static boolean equals​(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex)
    Returns true if the two specified arrays of Objects, over the specified ranges, are equal to one another.
    static boolean equals​(Object[] a, Object[] a2)
    Returns true if the two specified arrays of Objects are equal to one another.
    static <T> boolean equals​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
    Returns true if the two specified arrays of Objects, over the specified ranges, are equal to one another.
    static <T> boolean equals​(T[] a, T[] a2, Comparator<? super T> cmp)
    Returns true if the two specified arrays of Objects are equal to one another.
    static void fill​(boolean[] a, boolean val)
    Assigns the specified boolean value to each element of the specified array of booleans.
    static void fill​(boolean[] a, int fromIndex, int toIndex, boolean val)
    Assigns the specified boolean value to each element of the specified range of the specified array of booleans.
    static void fill​(byte[] a, byte val)
    Assigns the specified byte value to each element of the specified array of bytes.
    static void fill​(byte[] a, int fromIndex, int toIndex, byte val)
    Assigns the specified byte value to each element of the specified range of the specified array of bytes.
    static void fill​(char[] a, char val)
    Assigns the specified char value to each element of the specified array of chars.
    static void fill​(char[] a, int fromIndex, int toIndex, char val)
    Assigns the specified char value to each element of the specified range of the specified array of chars.
    static void fill​(double[] a, double val)
    Assigns the specified double value to each element of the specified array of doubles.
    static void fill​(double[] a, int fromIndex, int toIndex, double val)
    Assigns the specified double value to each element of the specified range of the specified array of doubles.
    static void fill​(float[] a, float val)
    Assigns the specified float value to each element of the specified array of floats.
    static void fill​(float[] a, int fromIndex, int toIndex, float val)
    Assigns the specified float value to each element of the specified range of the specified array of floats.
    static void fill​(int[] a, int val)
    Assigns the specified int value to each element of the specified array of ints.
    static void fill​(int[] a, int fromIndex, int toIndex, int val)
    Assigns the specified int value to each element of the specified range of the specified array of ints.
    static void fill​(long[] a, int fromIndex, int toIndex, long val)
    Assigns the specified long value to each element of the specified range of the specified array of longs.
    static void fill​(long[] a, long val)
    Assigns the specified long value to each element of the specified array of longs.
    static void fill​(short[] a, int fromIndex, int toIndex, short val)
    Assigns the specified short value to each element of the specified range of the specified array of shorts.
    static void fill​(short[] a, short val)
    Assigns the specified short value to each element of the specified array of shorts.
    static void fill​(Object[] a, int fromIndex, int toIndex, Object val)
    Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
    static void fill​(Object[] a, Object val)
    Assigns the specified Object reference to each element of the specified array of Objects.
    static int hashCode​(boolean[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(byte[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(char[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(double[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(float[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(int[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(long[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(short[] a)
    Returns a hash code based on the contents of the specified array.
    static int hashCode​(Object[] a)
    Returns a hash code based on the contents of the specified array.
    static int mismatch​(boolean[] a, boolean[] b)
    Finds and returns the index of the first mismatch between two boolean arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two boolean arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(byte[] a, byte[] b)
    Finds and returns the index of the first mismatch between two byte arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two byte arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(char[] a, char[] b)
    Finds and returns the index of the first mismatch between two char arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two char arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(double[] a, double[] b)
    Finds and returns the index of the first mismatch between two double arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two double arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(float[] a, float[] b)
    Finds and returns the index of the first mismatch between two float arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two float arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(int[] a, int[] b)
    Finds and returns the index of the first mismatch between two int arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two int arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two long arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(long[] a, long[] b)
    Finds and returns the index of the first mismatch between two long arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two short arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(short[] a, short[] b)
    Finds and returns the index of the first mismatch between two short arrays, otherwise return -1 if no mismatch is found.
    static int mismatch​(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex)
    Finds and returns the relative index of the first mismatch between two Object arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static int mismatch​(Object[] a, Object[] b)
    Finds and returns the index of the first mismatch between two Object arrays, otherwise return -1 if no mismatch is found.
    static <T> int mismatch​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
    Finds and returns the relative index of the first mismatch between two Object arrays over the specified ranges, otherwise return -1 if no mismatch is found.
    static <T> int mismatch​(T[] a, T[] b, Comparator<? super T> cmp)
    Finds and returns the index of the first mismatch between two Object arrays, otherwise return -1 if no mismatch is found.
    static void parallelPrefix​(double[] array, int fromIndex, int toIndex, DoubleBinaryOperator op)
    Performs parallelPrefix(double[], DoubleBinaryOperator) for the given subrange of the array.
    static void parallelPrefix​(double[] array, DoubleBinaryOperator op)
    Cumulates, in parallel, each element of the given array in place, using the supplied function.
    static void parallelPrefix​(int[] array, int fromIndex, int toIndex, IntBinaryOperator op)
    Performs parallelPrefix(int[], IntBinaryOperator) for the given subrange of the array.
    static void parallelPrefix​(int[] array, IntBinaryOperator op)
    Cumulates, in parallel, each element of the given array in place, using the supplied function.
    static void parallelPrefix​(long[] array, int fromIndex, int toIndex, LongBinaryOperator op)
    Performs parallelPrefix(long[], LongBinaryOperator) for the given subrange of the array.
    static void parallelPrefix​(long[] array, LongBinaryOperator op)
    Cumulates, in parallel, each element of the given array in place, using the supplied function.
    static <T> void parallelPrefix​(T[] array, int fromIndex, int toIndex, BinaryOperator<T> op)
    Performs parallelPrefix(Object[], BinaryOperator) for the given subrange of the array.
    static <T> void parallelPrefix​(T[] array, BinaryOperator<T> op)
    Cumulates, in parallel, each element of the given array in place, using the supplied function.
    static void parallelSetAll​(double[] array, IntToDoubleFunction generator)
    Set all elements of the specified array, in parallel, using the provided generator function to compute each element.
    static void parallelSetAll​(int[] array, IntUnaryOperator generator)
    Set all elements of the specified array, in parallel, using the provided generator function to compute each element.
    static void parallelSetAll​(long[] array, IntToLongFunction generator)
    Set all elements of the specified array, in parallel, using the provided generator function to compute each element.
    static <T> void parallelSetAll​(T[] array, IntFunction<? extends T> generator)
    Set all elements of the specified array, in parallel, using the provided generator function to compute each element.
    static void parallelSort​(byte[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(byte[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(char[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(char[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(double[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(double[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(float[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(float[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(int[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(int[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(long[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(long[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static void parallelSort​(short[] a)
    Sorts the specified array into ascending numerical order.
    static void parallelSort​(short[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending numerical order.
    static <T extends Comparable<? super T>>
    void
    parallelSort​(T[] a)
    Sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
    static <T extends Comparable<? super T>>
    void
    parallelSort​(T[] a, int fromIndex, int toIndex)
    Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements.
    static <T> void parallelSort​(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp)
    Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
    static <T> void parallelSort​(T[] a, Comparator<? super T> cmp)
    Sorts the specified array of objects according to the order induced by the specified comparator.
    static void setAll​(double[] array, IntToDoubleFunction generator)
    Set all elements of the specified array, using the provided generator function to compute each element.
    static void setAll​(int[] array, IntUnaryOperator generator)
    Set all elements of the specified array, using the provided generator function to compute each element.
    static void setAll​(long[] array, IntToLongFunction generator)
    Set all elements of the specified array, using the provided generator function to compute each element.
    static <T> void setAll​(T[] array, IntFunction<? extends T> generator)
    Set all elements of the specified array, using the provided generator function to compute each element.
    static void sort​(byte[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(byte[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(char[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(char[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(double[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(double[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(float[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(float[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(int[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(int[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(long[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(long[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(short[] a)
    Sorts the specified array into ascending numerical order.
    static void sort​(short[] a, int fromIndex, int toIndex)
    Sorts the specified range of the array into ascending order.
    static void sort​(Object[] a)
    Sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
    static void sort​(Object[] a, int fromIndex, int toIndex)
    Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements.
    static <T> void sort​(T[] a, int fromIndex, int toIndex, Comparator<? super T> c)
    Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
    static <T> void sort​(T[] a, Comparator<? super T> c)
    Sorts the specified array of objects according to the order induced by the specified comparator.
    static Spliterator.OfDouble spliterator​(double[] array)
    Returns a Spliterator.OfDouble covering all of the specified array.
    static Spliterator.OfDouble spliterator​(double[] array, int startInclusive, int endExclusive)
    Returns a Spliterator.OfDouble covering the specified range of the specified array.
    static Spliterator.OfInt spliterator​(int[] array)
    Returns a Spliterator.OfInt covering all of the specified array.
    static Spliterator.OfInt spliterator​(int[] array, int startInclusive, int endExclusive)
    Returns a Spliterator.OfInt covering the specified range of the specified array.
    static Spliterator.OfLong spliterator​(long[] array)
    Returns a Spliterator.OfLong covering all of the specified array.
    static Spliterator.OfLong spliterator​(long[] array, int startInclusive, int endExclusive)
    Returns a Spliterator.OfLong covering the specified range of the specified array.
    static <T> Spliterator<T> spliterator​(T[] array)
    Returns a Spliterator covering all of the specified array.
    static <T> Spliterator<T> spliterator​(T[] array, int startInclusive, int endExclusive)
    Returns a Spliterator covering the specified range of the specified array.
    static DoubleStream stream​(double[] array)
    Returns a sequential DoubleStream with the specified array as its source.
    static DoubleStream stream​(double[] array, int startInclusive, int endExclusive)
    Returns a sequential DoubleStream with the specified range of the specified array as its source.
    static IntStream stream​(int[] array)
    Returns a sequential IntStream with the specified array as its source.
    static IntStream stream​(int[] array, int startInclusive, int endExclusive)
    Returns a sequential IntStream with the specified range of the specified array as its source.
    static LongStream stream​(long[] array)
    Returns a sequential LongStream with the specified array as its source.
    static LongStream stream​(long[] array, int startInclusive, int endExclusive)
    Returns a sequential LongStream with the specified range of the specified array as its source.
    static <T> Stream<T> stream​(T[] array)
    Returns a sequential Stream with the specified array as its source.
    static <T> Stream<T> stream​(T[] array, int startInclusive, int endExclusive)
    Returns a sequential Stream with the specified range of the specified array as its source.
    static String toString​(boolean[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(byte[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(char[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(double[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(float[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(int[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(long[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(short[] a)
    Returns a string representation of the contents of the specified array.
    static String toString​(Object[] a)
    Returns a string representation of the contents of the specified array.

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Method Details

    • sort

      public static void sort​(int[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(int[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(long[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(long[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(short[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(short[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(char[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(char[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(byte[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(byte[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(float[] a)
      Sorts the specified array into ascending numerical order.

      The < relation does not provide a total order on all float values: -0.0f == 0.0f is true and a Float.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Float.compareTo(java.lang.Float): -0.0f is treated as less than value 0.0f and Float.NaN is considered greater than any other value and all Float.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(float[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.

      The < relation does not provide a total order on all float values: -0.0f == 0.0f is true and a Float.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Float.compareTo(java.lang.Float): -0.0f is treated as less than value 0.0f and Float.NaN is considered greater than any other value and all Float.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • sort

      public static void sort​(double[] a)
      Sorts the specified array into ascending numerical order.

      The < relation does not provide a total order on all double values: -0.0d == 0.0d is true and a Double.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Double.compareTo(java.lang.Double): -0.0d is treated as less than value 0.0d and Double.NaN is considered greater than any other value and all Double.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
    • sort

      public static void sort​(double[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.

      The < relation does not provide a total order on all double values: -0.0d == 0.0d is true and a Double.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Double.compareTo(java.lang.Double): -0.0d is treated as less than value 0.0d and Double.NaN is considered greater than any other value and all Double.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • parallelSort

      public static void parallelSort​(byte[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(byte[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(char[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(char[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(short[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(short[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(int[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(int[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(long[] a)
      Sorts the specified array into ascending numerical order.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(long[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.
      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(float[] a)
      Sorts the specified array into ascending numerical order.

      The < relation does not provide a total order on all float values: -0.0f == 0.0f is true and a Float.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Float.compareTo(java.lang.Float): -0.0f is treated as less than value 0.0f and Float.NaN is considered greater than any other value and all Float.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(float[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.

      The < relation does not provide a total order on all float values: -0.0f == 0.0f is true and a Float.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Float.compareTo(java.lang.Float): -0.0f is treated as less than value 0.0f and Float.NaN is considered greater than any other value and all Float.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(double[] a)
      Sorts the specified array into ascending numerical order.

      The < relation does not provide a total order on all double values: -0.0d == 0.0d is true and a Double.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Double.compareTo(java.lang.Double): -0.0d is treated as less than value 0.0d and Double.NaN is considered greater than any other value and all Double.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      Since:
      1.8
    • parallelSort

      public static void parallelSort​(double[] a, int fromIndex, int toIndex)
      Sorts the specified range of the array into ascending numerical order. The range to be sorted extends from the index fromIndex, inclusive, to the index toIndex, exclusive. If fromIndex == toIndex, the range to be sorted is empty.

      The < relation does not provide a total order on all double values: -0.0d == 0.0d is true and a Double.NaN value compares neither less than, greater than, nor equal to any value, even itself. This method uses the total order imposed by the method Double.compareTo(java.lang.Double): -0.0d is treated as less than value 0.0d and Double.NaN is considered greater than any other value and all Double.NaN values are considered equal.

      Implementation Note:
      The sorting algorithm is a Dual-Pivot Quicksort by Vladimir Yaroslavskiy, Jon Bentley and Josh Bloch. This algorithm offers O(n log(n)) performance on all data sets, and is typically faster than traditional (one-pivot) Quicksort implementations.
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element, inclusive, to be sorted
      toIndex - the index of the last element, exclusive, to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.8
    • parallelSort

      public static <T extends Comparable<? super T>> void parallelSort​(T[] a)
      Sorts the specified array of objects into ascending order, according to the natural ordering of its elements. All elements in the array must implement the Comparable interface. Furthermore, all elements in the array must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation Note:
      The sorting algorithm is a parallel sort-merge that breaks the array into sub-arrays that are themselves sorted and then merged. When the sub-array length reaches a minimum granularity, the sub-array is sorted using the appropriate Arrays.sort method. If the length of the specified array is less than the minimum granularity, then it is sorted using the appropriate Arrays.sort method. The algorithm requires a working space no greater than the size of the original array. The ForkJoin common pool is used to execute any parallel tasks.
      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable (for example, strings and integers)
      IllegalArgumentException - (optional) if the natural ordering of the array elements is found to violate the Comparable contract
      Since:
      1.8
    • parallelSort

      public static <T extends Comparable<? super T>> void parallelSort​(T[] a, int fromIndex, int toIndex)
      Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in this range must implement the Comparable interface. Furthermore, all elements in this range must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation Note:
      The sorting algorithm is a parallel sort-merge that breaks the array into sub-arrays that are themselves sorted and then merged. When the sub-array length reaches a minimum granularity, the sub-array is sorted using the appropriate Arrays.sort method. If the length of the specified array is less than the minimum granularity, then it is sorted using the appropriate Arrays.sort method. The algorithm requires a working space no greater than the size of the specified range of the original array. The ForkJoin common pool is used to execute any parallel tasks.
      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element (inclusive) to be sorted
      toIndex - the index of the last element (exclusive) to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex or (optional) if the natural ordering of the array elements is found to violate the Comparable contract
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      ClassCastException - if the array contains elements that are not mutually comparable (for example, strings and integers).
      Since:
      1.8
    • parallelSort

      public static <T> void parallelSort​(T[] a, Comparator<? super T> cmp)
      Sorts the specified array of objects according to the order induced by the specified comparator. All elements in the array must be mutually comparable by the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation Note:
      The sorting algorithm is a parallel sort-merge that breaks the array into sub-arrays that are themselves sorted and then merged. When the sub-array length reaches a minimum granularity, the sub-array is sorted using the appropriate Arrays.sort method. If the length of the specified array is less than the minimum granularity, then it is sorted using the appropriate Arrays.sort method. The algorithm requires a working space no greater than the size of the original array. The ForkJoin common pool is used to execute any parallel tasks.
      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      cmp - the comparator to determine the order of the array. A null value indicates that the elements' natural ordering should be used.
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable using the specified comparator
      IllegalArgumentException - (optional) if the comparator is found to violate the Comparator contract
      Since:
      1.8
    • parallelSort

      public static <T> void parallelSort​(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp)
      Sorts the specified range of the specified array of objects according to the order induced by the specified comparator. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in the range must be mutually comparable by the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the range).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation Note:
      The sorting algorithm is a parallel sort-merge that breaks the array into sub-arrays that are themselves sorted and then merged. When the sub-array length reaches a minimum granularity, the sub-array is sorted using the appropriate Arrays.sort method. If the length of the specified array is less than the minimum granularity, then it is sorted using the appropriate Arrays.sort method. The algorithm requires a working space no greater than the size of the specified range of the original array. The ForkJoin common pool is used to execute any parallel tasks.
      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element (inclusive) to be sorted
      toIndex - the index of the last element (exclusive) to be sorted
      cmp - the comparator to determine the order of the array. A null value indicates that the elements' natural ordering should be used.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex or (optional) if the natural ordering of the array elements is found to violate the Comparable contract
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      ClassCastException - if the array contains elements that are not mutually comparable (for example, strings and integers).
      Since:
      1.8
    • sort

      public static void sort​(Object[] a)
      Sorts the specified array of objects into ascending order, according to the natural ordering of its elements. All elements in the array must implement the Comparable interface. Furthermore, all elements in the array must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation note: This implementation is a stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when the input array is partially sorted, while offering the performance of a traditional mergesort when the input array is randomly ordered. If the input array is nearly sorted, the implementation requires approximately n comparisons. Temporary storage requirements vary from a small constant for nearly sorted input arrays to n/2 object references for randomly ordered input arrays.

      The implementation takes equal advantage of ascending and descending order in its input array, and can take advantage of ascending and descending order in different parts of the same input array. It is well-suited to merging two or more sorted arrays: simply concatenate the arrays and sort the resulting array.

      The implementation was adapted from Tim Peters's list sort for Python ( TimSort). It uses techniques from Peter McIlroy's "Optimistic Sorting and Information Theoretic Complexity", in Proceedings of the Fourth Annual ACM-SIAM Symposium on Discrete Algorithms, pp 467-474, January 1993.

      Parameters:
      a - the array to be sorted
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable (for example, strings and integers)
      IllegalArgumentException - (optional) if the natural ordering of the array elements is found to violate the Comparable contract
    • sort

      public static void sort​(Object[] a, int fromIndex, int toIndex)
      Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in this range must implement the Comparable interface. Furthermore, all elements in this range must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation note: This implementation is a stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when the input array is partially sorted, while offering the performance of a traditional mergesort when the input array is randomly ordered. If the input array is nearly sorted, the implementation requires approximately n comparisons. Temporary storage requirements vary from a small constant for nearly sorted input arrays to n/2 object references for randomly ordered input arrays.

      The implementation takes equal advantage of ascending and descending order in its input array, and can take advantage of ascending and descending order in different parts of the same input array. It is well-suited to merging two or more sorted arrays: simply concatenate the arrays and sort the resulting array.

      The implementation was adapted from Tim Peters's list sort for Python ( TimSort). It uses techniques from Peter McIlroy's "Optimistic Sorting and Information Theoretic Complexity", in Proceedings of the Fourth Annual ACM-SIAM Symposium on Discrete Algorithms, pp 467-474, January 1993.

      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element (inclusive) to be sorted
      toIndex - the index of the last element (exclusive) to be sorted
      Throws:
      IllegalArgumentException - if fromIndex > toIndex or (optional) if the natural ordering of the array elements is found to violate the Comparable contract
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      ClassCastException - if the array contains elements that are not mutually comparable (for example, strings and integers).
    • sort

      public static <T> void sort​(T[] a, Comparator<? super T> c)
      Sorts the specified array of objects according to the order induced by the specified comparator. All elements in the array must be mutually comparable by the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation note: This implementation is a stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when the input array is partially sorted, while offering the performance of a traditional mergesort when the input array is randomly ordered. If the input array is nearly sorted, the implementation requires approximately n comparisons. Temporary storage requirements vary from a small constant for nearly sorted input arrays to n/2 object references for randomly ordered input arrays.

      The implementation takes equal advantage of ascending and descending order in its input array, and can take advantage of ascending and descending order in different parts of the same input array. It is well-suited to merging two or more sorted arrays: simply concatenate the arrays and sort the resulting array.

      The implementation was adapted from Tim Peters's list sort for Python ( TimSort). It uses techniques from Peter McIlroy's "Optimistic Sorting and Information Theoretic Complexity", in Proceedings of the Fourth Annual ACM-SIAM Symposium on Discrete Algorithms, pp 467-474, January 1993.

      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      c - the comparator to determine the order of the array. A null value indicates that the elements' natural ordering should be used.
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable using the specified comparator
      IllegalArgumentException - (optional) if the comparator is found to violate the Comparator contract
    • sort

      public static <T> void sort​(T[] a, int fromIndex, int toIndex, Comparator<? super T> c)
      Sorts the specified range of the specified array of objects according to the order induced by the specified comparator. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in the range must be mutually comparable by the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the range).

      This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

      Implementation note: This implementation is a stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when the input array is partially sorted, while offering the performance of a traditional mergesort when the input array is randomly ordered. If the input array is nearly sorted, the implementation requires approximately n comparisons. Temporary storage requirements vary from a small constant for nearly sorted input arrays to n/2 object references for randomly ordered input arrays.

      The implementation takes equal advantage of ascending and descending order in its input array, and can take advantage of ascending and descending order in different parts of the same input array. It is well-suited to merging two or more sorted arrays: simply concatenate the arrays and sort the resulting array.

      The implementation was adapted from Tim Peters's list sort for Python ( TimSort). It uses techniques from Peter McIlroy's "Optimistic Sorting and Information Theoretic Complexity", in Proceedings of the Fourth Annual ACM-SIAM Symposium on Discrete Algorithms, pp 467-474, January 1993.

      Type Parameters:
      T - the class of the objects to be sorted
      Parameters:
      a - the array to be sorted
      fromIndex - the index of the first element (inclusive) to be sorted
      toIndex - the index of the last element (exclusive) to be sorted
      c - the comparator to determine the order of the array. A null value indicates that the elements' natural ordering should be used.
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable using the specified comparator.
      IllegalArgumentException - if fromIndex > toIndex or (optional) if the comparator is found to violate the Comparator contract
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • parallelPrefix

      public static <T> void parallelPrefix​(T[] array, BinaryOperator<T> op)
      Cumulates, in parallel, each element of the given array in place, using the supplied function. For example if the array initially holds [2, 1, 0, 3] and the operation performs addition, then upon return the array holds [2, 3, 3, 6]. Parallel prefix computation is usually more efficient than sequential loops for large arrays.
      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      array - the array, which is modified in-place by this method
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static <T> void parallelPrefix​(T[] array, int fromIndex, int toIndex, BinaryOperator<T> op)
      Performs parallelPrefix(Object[], BinaryOperator) for the given subrange of the array.
      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      array - the array
      fromIndex - the index of the first element, inclusive
      toIndex - the index of the last element, exclusive
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > array.length
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(long[] array, LongBinaryOperator op)
      Cumulates, in parallel, each element of the given array in place, using the supplied function. For example if the array initially holds [2, 1, 0, 3] and the operation performs addition, then upon return the array holds [2, 3, 3, 6]. Parallel prefix computation is usually more efficient than sequential loops for large arrays.
      Parameters:
      array - the array, which is modified in-place by this method
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(long[] array, int fromIndex, int toIndex, LongBinaryOperator op)
      Performs parallelPrefix(long[], LongBinaryOperator) for the given subrange of the array.
      Parameters:
      array - the array
      fromIndex - the index of the first element, inclusive
      toIndex - the index of the last element, exclusive
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > array.length
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(double[] array, DoubleBinaryOperator op)
      Cumulates, in parallel, each element of the given array in place, using the supplied function. For example if the array initially holds [2.0, 1.0, 0.0, 3.0] and the operation performs addition, then upon return the array holds [2.0, 3.0, 3.0, 6.0]. Parallel prefix computation is usually more efficient than sequential loops for large arrays.

      Because floating-point operations may not be strictly associative, the returned result may not be identical to the value that would be obtained if the operation was performed sequentially.

      Parameters:
      array - the array, which is modified in-place by this method
      op - a side-effect-free function to perform the cumulation
      Throws:
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(double[] array, int fromIndex, int toIndex, DoubleBinaryOperator op)
      Performs parallelPrefix(double[], DoubleBinaryOperator) for the given subrange of the array.
      Parameters:
      array - the array
      fromIndex - the index of the first element, inclusive
      toIndex - the index of the last element, exclusive
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > array.length
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(int[] array, IntBinaryOperator op)
      Cumulates, in parallel, each element of the given array in place, using the supplied function. For example if the array initially holds [2, 1, 0, 3] and the operation performs addition, then upon return the array holds [2, 3, 3, 6]. Parallel prefix computation is usually more efficient than sequential loops for large arrays.
      Parameters:
      array - the array, which is modified in-place by this method
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • parallelPrefix

      public static void parallelPrefix​(int[] array, int fromIndex, int toIndex, IntBinaryOperator op)
      Performs parallelPrefix(int[], IntBinaryOperator) for the given subrange of the array.
      Parameters:
      array - the array
      fromIndex - the index of the first element, inclusive
      toIndex - the index of the last element, exclusive
      op - a side-effect-free, associative function to perform the cumulation
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > array.length
      NullPointerException - if the specified array or function is null
      Since:
      1.8
    • binarySearch

      public static int binarySearch​(long[] a, long key)
      Searches the specified array of longs for the specified value using the binary search algorithm. The array must be sorted (as by the sort(long[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(long[] a, int fromIndex, int toIndex, long key)
      Searches a range of the specified array of longs for the specified value using the binary search algorithm. The range must be sorted (as by the sort(long[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(int[] a, int key)
      Searches the specified array of ints for the specified value using the binary search algorithm. The array must be sorted (as by the sort(int[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(int[] a, int fromIndex, int toIndex, int key)
      Searches a range of the specified array of ints for the specified value using the binary search algorithm. The range must be sorted (as by the sort(int[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(short[] a, short key)
      Searches the specified array of shorts for the specified value using the binary search algorithm. The array must be sorted (as by the sort(short[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(short[] a, int fromIndex, int toIndex, short key)
      Searches a range of the specified array of shorts for the specified value using the binary search algorithm. The range must be sorted (as by the sort(short[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(char[] a, char key)
      Searches the specified array of chars for the specified value using the binary search algorithm. The array must be sorted (as by the sort(char[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(char[] a, int fromIndex, int toIndex, char key)
      Searches a range of the specified array of chars for the specified value using the binary search algorithm. The range must be sorted (as by the sort(char[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(byte[] a, byte key)
      Searches the specified array of bytes for the specified value using the binary search algorithm. The array must be sorted (as by the sort(byte[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(byte[] a, int fromIndex, int toIndex, byte key)
      Searches a range of the specified array of bytes for the specified value using the binary search algorithm. The range must be sorted (as by the sort(byte[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(double[] a, double key)
      Searches the specified array of doubles for the specified value using the binary search algorithm. The array must be sorted (as by the sort(double[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(double[] a, int fromIndex, int toIndex, double key)
      Searches a range of the specified array of doubles for the specified value using the binary search algorithm. The range must be sorted (as by the sort(double[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(float[] a, float key)
      Searches the specified array of floats for the specified value using the binary search algorithm. The array must be sorted (as by the sort(float[]) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
    • binarySearch

      public static int binarySearch​(float[] a, int fromIndex, int toIndex, float key)
      Searches a range of the specified array of floats for the specified value using the binary search algorithm. The range must be sorted (as by the sort(float[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static int binarySearch​(Object[] a, Object key)
      Searches the specified array for the specified object using the binary search algorithm. The array must be sorted into ascending order according to the natural ordering of its elements (as by the sort(Object[]) method) prior to making this call. If it is not sorted, the results are undefined. (If the array contains elements that are not mutually comparable (for example, strings and integers), it cannot be sorted according to the natural ordering of its elements, hence results are undefined.) If the array contains multiple elements equal to the specified object, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      ClassCastException - if the search key is not comparable to the elements of the array.
    • binarySearch

      public static int binarySearch​(Object[] a, int fromIndex, int toIndex, Object key)
      Searches a range of the specified array for the specified object using the binary search algorithm. The range must be sorted into ascending order according to the natural ordering of its elements (as by the sort(Object[], int, int) method) prior to making this call. If it is not sorted, the results are undefined. (If the range contains elements that are not mutually comparable (for example, strings and integers), it cannot be sorted according to the natural ordering of its elements, hence results are undefined.) If the range contains multiple elements equal to the specified object, there is no guarantee which one will be found.
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      ClassCastException - if the search key is not comparable to the elements of the array within the specified range.
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • binarySearch

      public static <T> int binarySearch​(T[] a, T key, Comparator<? super T> c)
      Searches the specified array for the specified object using the binary search algorithm. The array must be sorted into ascending order according to the specified comparator (as by the sort(T[], Comparator) method) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements equal to the specified object, there is no guarantee which one will be found.
      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      a - the array to be searched
      key - the value to be searched for
      c - the comparator by which the array is ordered. A null value indicates that the elements' natural ordering should be used.
      Returns:
      index of the search key, if it is contained in the array; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element greater than the key, or a.length if all elements in the array are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      ClassCastException - if the array contains elements that are not mutually comparable using the specified comparator, or the search key is not comparable to the elements of the array using this comparator.
    • binarySearch

      public static <T> int binarySearch​(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c)
      Searches a range of the specified array for the specified object using the binary search algorithm. The range must be sorted into ascending order according to the specified comparator (as by the sort(T[], int, int, Comparator) method) prior to making this call. If it is not sorted, the results are undefined. If the range contains multiple elements equal to the specified object, there is no guarantee which one will be found.
      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      a - the array to be searched
      fromIndex - the index of the first element (inclusive) to be searched
      toIndex - the index of the last element (exclusive) to be searched
      key - the value to be searched for
      c - the comparator by which the array is ordered. A null value indicates that the elements' natural ordering should be used.
      Returns:
      index of the search key, if it is contained in the array within the specified range; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the array: the index of the first element in the range greater than the key, or toIndex if all elements in the range are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
      Throws:
      ClassCastException - if the range contains elements that are not mutually comparable using the specified comparator, or the search key is not comparable to the elements in the range using this comparator.
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      Since:
      1.6
    • equals

      public static boolean equals​(long[] a, long[] a2)
      Returns true if the two specified arrays of longs are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of longs, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(int[] a, int[] a2)
      Returns true if the two specified arrays of ints are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of ints, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(short[] a, short[] a2)
      Returns true if the two specified arrays of shorts are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of shorts, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(char[] a, char[] a2)
      Returns true if the two specified arrays of chars are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of chars, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(byte[] a, byte[] a2)
      Returns true if the two specified arrays of bytes are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of bytes, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(boolean[] a, boolean[] a2)
      Returns true if the two specified arrays of booleans are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of booleans, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static boolean equals​(double[] a, double[] a2)
      Returns true if the two specified arrays of doubles are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null. Two doubles d1 and d2 are considered equal if:
          new Double(d1).equals(new Double(d2))
      (Unlike the == operator, this method considers NaN equal to itself, and 0.0d unequal to -0.0d.)
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
      See Also:
      Double.equals(Object)
    • equals

      public static boolean equals​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of doubles, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Two doubles d1 and d2 are considered equal if:

          new Double(d1).equals(new Double(d2))
      (Unlike the == operator, this method considers NaN equal to itself, and 0.0d unequal to -0.0d.)

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
      See Also:
      Double.equals(Object)
    • equals

      public static boolean equals​(float[] a, float[] a2)
      Returns true if the two specified arrays of floats are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null. Two floats f1 and f2 are considered equal if:
          new Float(f1).equals(new Float(f2))
      (Unlike the == operator, this method considers NaN equal to itself, and 0.0f unequal to -0.0f.)
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
      See Also:
      Float.equals(Object)
    • equals

      public static boolean equals​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of floats, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Two floats f1 and f2 are considered equal if:

          new Float(f1).equals(new Float(f2))
      (Unlike the == operator, this method considers NaN equal to itself, and 0.0f unequal to -0.0f.)

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
      See Also:
      Float.equals(Object)
    • equals

      public static boolean equals​(Object[] a, Object[] a2)
      Returns true if the two specified arrays of Objects are equal to one another. The two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. Two objects e1 and e2 are considered equal if Objects.equals(e1, e2). In other words, the two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
    • equals

      public static boolean equals​(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex)
      Returns true if the two specified arrays of Objects, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Two objects e1 and e2 are considered equal if Objects.equals(e1, e2).

      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • equals

      public static <T> boolean equals​(T[] a, T[] a2, Comparator<? super T> cmp)
      Returns true if the two specified arrays of Objects are equal to one another.

      Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, the two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

      Two objects e1 and e2 are considered equal if, given the specified comparator, cmp.compare(e1, e2) == 0.

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - one array to be tested for equality
      a2 - the other array to be tested for equality
      cmp - the comparator to compare array elements
      Returns:
      true if the two arrays are equal
      Throws:
      NullPointerException - if the comparator is null
      Since:
      9
    • equals

      public static <T> boolean equals​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
      Returns true if the two specified arrays of Objects, over the specified ranges, are equal to one another.

      Two arrays are considered equal if the number of elements covered by each range is the same, and all corresponding pairs of elements over the specified ranges in the two arrays are equal. In other words, two arrays are equal if they contain, over the specified ranges, the same elements in the same order.

      Two objects e1 and e2 are considered equal if, given the specified comparator, cmp.compare(e1, e2) == 0.

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - the first array to be tested for equality
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for equality
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      cmp - the comparator to compare array elements
      Returns:
      true if the two arrays, over the specified ranges, are equal
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array or the comparator is null
      Since:
      9
    • fill

      public static void fill​(long[] a, long val)
      Assigns the specified long value to each element of the specified array of longs.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(long[] a, int fromIndex, int toIndex, long val)
      Assigns the specified long value to each element of the specified range of the specified array of longs. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(int[] a, int val)
      Assigns the specified int value to each element of the specified array of ints.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(int[] a, int fromIndex, int toIndex, int val)
      Assigns the specified int value to each element of the specified range of the specified array of ints. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(short[] a, short val)
      Assigns the specified short value to each element of the specified array of shorts.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(short[] a, int fromIndex, int toIndex, short val)
      Assigns the specified short value to each element of the specified range of the specified array of shorts. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(char[] a, char val)
      Assigns the specified char value to each element of the specified array of chars.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(char[] a, int fromIndex, int toIndex, char val)
      Assigns the specified char value to each element of the specified range of the specified array of chars. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(byte[] a, byte val)
      Assigns the specified byte value to each element of the specified array of bytes.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(byte[] a, int fromIndex, int toIndex, byte val)
      Assigns the specified byte value to each element of the specified range of the specified array of bytes. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(boolean[] a, boolean val)
      Assigns the specified boolean value to each element of the specified array of booleans.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(boolean[] a, int fromIndex, int toIndex, boolean val)
      Assigns the specified boolean value to each element of the specified range of the specified array of booleans. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(double[] a, double val)
      Assigns the specified double value to each element of the specified array of doubles.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(double[] a, int fromIndex, int toIndex, double val)
      Assigns the specified double value to each element of the specified range of the specified array of doubles. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(float[] a, float val)
      Assigns the specified float value to each element of the specified array of floats.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
    • fill

      public static void fill​(float[] a, int fromIndex, int toIndex, float val)
      Assigns the specified float value to each element of the specified range of the specified array of floats. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
    • fill

      public static void fill​(Object[] a, Object val)
      Assigns the specified Object reference to each element of the specified array of Objects.
      Parameters:
      a - the array to be filled
      val - the value to be stored in all elements of the array
      Throws:
      ArrayStoreException - if the specified value is not of a runtime type that can be stored in the specified array
    • fill

      public static void fill​(Object[] a, int fromIndex, int toIndex, Object val)
      Assigns the specified Object reference to each element of the specified range of the specified array of Objects. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)
      Parameters:
      a - the array to be filled
      fromIndex - the index of the first element (inclusive) to be filled with the specified value
      toIndex - the index of the last element (exclusive) to be filled with the specified value
      val - the value to be stored in all elements of the array
      Throws:
      IllegalArgumentException - if fromIndex > toIndex
      ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
      ArrayStoreException - if the specified value is not of a runtime type that can be stored in the specified array
    • copyOf

      public static <T> T[] copyOf​(T[] original, int newLength)
      Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain null. Such indices will exist if and only if the specified length is greater than that of the original array. The resulting array is of exactly the same class as the original array.
      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with nulls to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static <T,​ U> T[] copyOf​(U[] original, int newLength, Class<? extends T[]> newType)
      Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain null. Such indices will exist if and only if the specified length is greater than that of the original array. The resulting array is of the class newType.
      Type Parameters:
      U - the class of the objects in the original array
      T - the class of the objects in the returned array
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      newType - the class of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with nulls to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      ArrayStoreException - if an element copied from original is not of a runtime type that can be stored in an array of class newType
      Since:
      1.6
    • copyOf

      public static byte[] copyOf​(byte[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain (byte)0. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static short[] copyOf​(short[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain (short)0. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static int[] copyOf​(int[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static long[] copyOf​(long[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0L. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static char[] copyOf​(char[] original, int newLength)
      Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain '\u0000'. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with null characters to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static float[] copyOf​(float[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0f. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static double[] copyOf​(double[] original, int newLength)
      Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0d. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with zeros to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOf

      public static boolean[] copyOf​(boolean[] original, int newLength)
      Copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain false. Such indices will exist if and only if the specified length is greater than that of the original array.
      Parameters:
      original - the array to be copied
      newLength - the length of the copy to be returned
      Returns:
      a copy of the original array, truncated or padded with false elements to obtain the specified length
      Throws:
      NegativeArraySizeException - if newLength is negative
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static <T> T[] copyOfRange​(T[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case null is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.

      The resulting array is of exactly the same class as the original array.

      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with nulls to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static <T,​ U> T[] copyOfRange​(U[] original, int from, int to, Class<? extends T[]> newType)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case null is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from. The resulting array is of the class newType.
      Type Parameters:
      U - the class of the objects in the original array
      T - the class of the objects in the returned array
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      newType - the class of the copy to be returned
      Returns:
      a new array containing the specified range from the original array, truncated or padded with nulls to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      ArrayStoreException - if an element copied from original is not of a runtime type that can be stored in an array of class newType.
      Since:
      1.6
    • copyOfRange

      public static byte[] copyOfRange​(byte[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case (byte)0 is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static short[] copyOfRange​(short[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case (short)0 is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static int[] copyOfRange​(int[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case 0 is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static long[] copyOfRange​(long[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case 0L is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static char[] copyOfRange​(char[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case '\u0000' is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with null characters to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static float[] copyOfRange​(float[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case 0f is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static double[] copyOfRange​(double[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case 0d is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with zeros to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • copyOfRange

      public static boolean[] copyOfRange​(boolean[] original, int from, int to)
      Copies the specified range of the specified array into a new array. The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case false is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.
      Parameters:
      original - the array from which a range is to be copied
      from - the initial index of the range to be copied, inclusive
      to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)
      Returns:
      a new array containing the specified range from the original array, truncated or padded with false elements to obtain the required length
      Throws:
      ArrayIndexOutOfBoundsException - if from < 0 or from > original.length
      IllegalArgumentException - if from > to
      NullPointerException - if original is null
      Since:
      1.6
    • asList

      @SafeVarargs public static <T> List<T> asList​(T... a)
      Returns a fixed-size list backed by the specified array. Changes made to the array will be visible in the returned list, and changes made to the list will be visible in the array. The returned list is Serializable and implements RandomAccess.

      The returned list implements the optional Collection methods, except those that would change the size of the returned list. Those methods leave the list unchanged and throw UnsupportedOperationException.

      API Note:
      This method acts as bridge between array-based and collection-based APIs, in combination with Collection.toArray().

      This method provides a way to wrap an existing array:

      
           Integer[] numbers = ...
           ...
           List<Integer> values = Arrays.asList(numbers);
       

      This method also provides a convenient way to create a fixed-size list initialized to contain several elements:

      
           List<String> stooges = Arrays.asList("Larry", "Moe", "Curly");
       

      The list returned by this method is modifiable. To create an unmodifiable list, use Collections.unmodifiableList or Unmodifiable Lists.

      Type Parameters:
      T - the class of the objects in the array
      Parameters:
      a - the array by which the list will be backed
      Returns:
      a list view of the specified array
      Throws:
      NullPointerException - if the specified array is null
    • hashCode

      public static int hashCode​(long[] a)
      Returns a hash code based on the contents of the specified array. For any two long arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Long instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(int[] a)
      Returns a hash code based on the contents of the specified array. For any two non-null int arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Integer instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(short[] a)
      Returns a hash code based on the contents of the specified array. For any two short arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Short instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(char[] a)
      Returns a hash code based on the contents of the specified array. For any two char arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Character instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(byte[] a)
      Returns a hash code based on the contents of the specified array. For any two byte arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Byte instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(boolean[] a)
      Returns a hash code based on the contents of the specified array. For any two boolean arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Boolean instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(float[] a)
      Returns a hash code based on the contents of the specified array. For any two float arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Float instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(double[] a)
      Returns a hash code based on the contents of the specified array. For any two double arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is the same value that would be obtained by invoking the hashCode method on a List containing a sequence of Double instances representing the elements of a in the same order. If a is null, this method returns 0.

      Parameters:
      a - the array whose hash value to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
    • hashCode

      public static int hashCode​(Object[] a)
      Returns a hash code based on the contents of the specified array. If the array contains other arrays as elements, the hash code is based on their identities rather than their contents. It is therefore acceptable to invoke this method on an array that contains itself as an element, either directly or indirectly through one or more levels of arrays.

      For any two arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).

      The value returned by this method is equal to the value that would be returned by Arrays.asList(a).hashCode(), unless a is null, in which case 0 is returned.

      Parameters:
      a - the array whose content-based hash code to compute
      Returns:
      a content-based hash code for a
      Since:
      1.5
      See Also:
      deepHashCode(Object[])
    • deepHashCode

      public static int deepHashCode​(Object[] a)
      Returns a hash code based on the "deep contents" of the specified array. If the array contains other arrays as elements, the hash code is based on their contents and so on, ad infinitum. It is therefore unacceptable to invoke this method on an array that contains itself as an element, either directly or indirectly through one or more levels of arrays. The behavior of such an invocation is undefined.

      For any two arrays a and b such that Arrays.deepEquals(a, b), it is also the case that Arrays.deepHashCode(a) == Arrays.deepHashCode(b).

      The computation of the value returned by this method is similar to that of the value returned by List.hashCode() on a list containing the same elements as a in the same order, with one difference: If an element e of a is itself an array, its hash code is computed not by calling e.hashCode(), but as by calling the appropriate overloading of Arrays.hashCode(e) if e is an array of a primitive type, or as by calling Arrays.deepHashCode(e) recursively if e is an array of a reference type. If a is null, this method returns 0.

      Parameters:
      a - the array whose deep-content-based hash code to compute
      Returns:
      a deep-content-based hash code for a
      Since:
      1.5
      See Also:
      hashCode(Object[])
    • deepEquals

      public static boolean deepEquals​(Object[] a1, Object[] a2)
      Returns true if the two specified arrays are deeply equal to one another. Unlike the equals(Object[],Object[]) method, this method is appropriate for use with nested arrays of arbitrary depth.

      Two array references are considered deeply equal if both are null, or if they refer to arrays that contain the same number of elements and all corresponding pairs of elements in the two arrays are deeply equal.

      Two possibly null elements e1 and e2 are deeply equal if any of the following conditions hold:

      • e1 and e2 are both arrays of object reference types, and Arrays.deepEquals(e1, e2) would return true
      • e1 and e2 are arrays of the same primitive type, and the appropriate overloading of Arrays.equals(e1, e2) would return true.
      • e1 == e2
      • e1.equals(e2) would return true.
      Note that this definition permits null elements at any depth.

      If either of the specified arrays contain themselves as elements either directly or indirectly through one or more levels of arrays, the behavior of this method is undefined.

      Parameters:
      a1 - one array to be tested for equality
      a2 - the other array to be tested for equality
      Returns:
      true if the two arrays are equal
      Since:
      1.5
      See Also:
      equals(Object[],Object[]), Objects.deepEquals(Object, Object)
    • toString

      public static String toString​(long[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(long). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(int[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(int). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(short[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(short). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(char[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(char). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(byte[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(byte). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(boolean[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(boolean). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(float[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(float). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(double[] a)
      Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(double). Returns "null" if a is null.
      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
    • toString

      public static String toString​(Object[] a)
      Returns a string representation of the contents of the specified array. If the array contains other arrays as elements, they are converted to strings by the Object.toString() method inherited from Object, which describes their identities rather than their contents.

      The value returned by this method is equal to the value that would be returned by Arrays.asList(a).toString(), unless a is null, in which case "null" is returned.

      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
      See Also:
      deepToString(Object[])
    • deepToString

      public static String deepToString​(Object[] a)
      Returns a string representation of the "deep contents" of the specified array. If the array contains other arrays as elements, the string representation contains their contents and so on. This method is designed for converting multidimensional arrays to strings.

      The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(Object), unless they are themselves arrays.

      If an element e is an array of a primitive type, it is converted to a string as by invoking the appropriate overloading of Arrays.toString(e). If an element e is an array of a reference type, it is converted to a string as by invoking this method recursively.

      To avoid infinite recursion, if the specified array contains itself as an element, or contains an indirect reference to itself through one or more levels of arrays, the self-reference is converted to the string "[...]". For example, an array containing only a reference to itself would be rendered as "[[...]]".

      This method returns "null" if the specified array is null.

      Parameters:
      a - the array whose string representation to return
      Returns:
      a string representation of a
      Since:
      1.5
      See Also:
      toString(Object[])
    • setAll

      public static <T> void setAll​(T[] array, IntFunction<? extends T> generator)
      Set all elements of the specified array, using the provided generator function to compute each element.

      If the generator function throws an exception, it is relayed to the caller and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .forEach(i -> array[i] = generator.apply(i));
       
      Type Parameters:
      T - type of elements of the array
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • parallelSetAll

      public static <T> void parallelSetAll​(T[] array, IntFunction<? extends T> generator)
      Set all elements of the specified array, in parallel, using the provided generator function to compute each element.

      If the generator function throws an exception, an unchecked exception is thrown from parallelSetAll and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, in parallel, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .parallel()
                .forEach(i -> array[i] = generator.apply(i));
       
      Type Parameters:
      T - type of elements of the array
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • setAll

      public static void setAll​(int[] array, IntUnaryOperator generator)
      Set all elements of the specified array, using the provided generator function to compute each element.

      If the generator function throws an exception, it is relayed to the caller and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .forEach(i -> array[i] = generator.applyAsInt(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • parallelSetAll

      public static void parallelSetAll​(int[] array, IntUnaryOperator generator)
      Set all elements of the specified array, in parallel, using the provided generator function to compute each element.

      If the generator function throws an exception, an unchecked exception is thrown from parallelSetAll and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, in parallel, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .parallel()
                .forEach(i -> array[i] = generator.applyAsInt(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • setAll

      public static void setAll​(long[] array, IntToLongFunction generator)
      Set all elements of the specified array, using the provided generator function to compute each element.

      If the generator function throws an exception, it is relayed to the caller and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .forEach(i -> array[i] = generator.applyAsLong(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • parallelSetAll

      public static void parallelSetAll​(long[] array, IntToLongFunction generator)
      Set all elements of the specified array, in parallel, using the provided generator function to compute each element.

      If the generator function throws an exception, an unchecked exception is thrown from parallelSetAll and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, in parallel, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .parallel()
                .forEach(i -> array[i] = generator.applyAsLong(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • setAll

      public static void setAll​(double[] array, IntToDoubleFunction generator)
      Set all elements of the specified array, using the provided generator function to compute each element.

      If the generator function throws an exception, it is relayed to the caller and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .forEach(i -> array[i] = generator.applyAsDouble(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • parallelSetAll

      public static void parallelSetAll​(double[] array, IntToDoubleFunction generator)
      Set all elements of the specified array, in parallel, using the provided generator function to compute each element.

      If the generator function throws an exception, an unchecked exception is thrown from parallelSetAll and the array is left in an indeterminate state.

      API Note:
      Setting a subrange of an array, in parallel, using a generator function to compute each element, can be written as follows:
      
       IntStream.range(startInclusive, endExclusive)
                .parallel()
                .forEach(i -> array[i] = generator.applyAsDouble(i));
       
      Parameters:
      array - array to be initialized
      generator - a function accepting an index and producing the desired value for that position
      Throws:
      NullPointerException - if the generator is null
      Since:
      1.8
    • spliterator

      public static <T> Spliterator<T> spliterator​(T[] array)
      Returns a Spliterator covering all of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Type Parameters:
      T - type of elements
      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      a spliterator for the array elements
      Since:
      1.8
    • spliterator

      public static <T> Spliterator<T> spliterator​(T[] array, int startInclusive, int endExclusive)
      Returns a Spliterator covering the specified range of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Type Parameters:
      T - type of elements
      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a spliterator for the array elements
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • spliterator

      public static Spliterator.OfInt spliterator​(int[] array)
      Returns a Spliterator.OfInt covering all of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      a spliterator for the array elements
      Since:
      1.8
    • spliterator

      public static Spliterator.OfInt spliterator​(int[] array, int startInclusive, int endExclusive)
      Returns a Spliterator.OfInt covering the specified range of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a spliterator for the array elements
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • spliterator

      public static Spliterator.OfLong spliterator​(long[] array)
      Returns a Spliterator.OfLong covering all of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      the spliterator for the array elements
      Since:
      1.8
    • spliterator

      public static Spliterator.OfLong spliterator​(long[] array, int startInclusive, int endExclusive)
      Returns a Spliterator.OfLong covering the specified range of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a spliterator for the array elements
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • spliterator

      public static Spliterator.OfDouble spliterator​(double[] array)
      Returns a Spliterator.OfDouble covering all of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      a spliterator for the array elements
      Since:
      1.8
    • spliterator

      public static Spliterator.OfDouble spliterator​(double[] array, int startInclusive, int endExclusive)
      Returns a Spliterator.OfDouble covering the specified range of the specified array.

      The spliterator reports Spliterator.SIZED, Spliterator.SUBSIZED, Spliterator.ORDERED, and Spliterator.IMMUTABLE.

      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a spliterator for the array elements
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • stream

      public static <T> Stream<T> stream​(T[] array)
      Returns a sequential Stream with the specified array as its source.
      Type Parameters:
      T - The type of the array elements
      Parameters:
      array - The array, assumed to be unmodified during use
      Returns:
      a Stream for the array
      Since:
      1.8
    • stream

      public static <T> Stream<T> stream​(T[] array, int startInclusive, int endExclusive)
      Returns a sequential Stream with the specified range of the specified array as its source.
      Type Parameters:
      T - the type of the array elements
      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a Stream for the array range
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • stream

      public static IntStream stream​(int[] array)
      Returns a sequential IntStream with the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      an IntStream for the array
      Since:
      1.8
    • stream

      public static IntStream stream​(int[] array, int startInclusive, int endExclusive)
      Returns a sequential IntStream with the specified range of the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      an IntStream for the array range
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • stream

      public static LongStream stream​(long[] array)
      Returns a sequential LongStream with the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      a LongStream for the array
      Since:
      1.8
    • stream

      public static LongStream stream​(long[] array, int startInclusive, int endExclusive)
      Returns a sequential LongStream with the specified range of the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a LongStream for the array range
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • stream

      public static DoubleStream stream​(double[] array)
      Returns a sequential DoubleStream with the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      Returns:
      a DoubleStream for the array
      Since:
      1.8
    • stream

      public static DoubleStream stream​(double[] array, int startInclusive, int endExclusive)
      Returns a sequential DoubleStream with the specified range of the specified array as its source.
      Parameters:
      array - the array, assumed to be unmodified during use
      startInclusive - the first index to cover, inclusive
      endExclusive - index immediately past the last index to cover
      Returns:
      a DoubleStream for the array range
      Throws:
      ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size
      Since:
      1.8
    • compare

      public static int compare​(boolean[] a, boolean[] b)
      Compares two boolean arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Boolean.compare(boolean, boolean), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(boolean[], boolean[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Boolean.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
      Compares two boolean arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Boolean.compare(boolean, boolean), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(boolean[], int, int, boolean[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Boolean.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(byte[] a, byte[] b)
      Compares two byte arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Byte.compare(byte, byte), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(byte[], byte[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Byte.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
      Compares two byte arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Byte.compare(byte, byte), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(byte[], int, int, byte[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Byte.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(byte[] a, byte[] b)
      Compares two byte arrays lexicographically, numerically treating elements as unsigned.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Byte.compareUnsigned(byte, byte), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(byte[], byte[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Byte.compareUnsigned(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
      Compares two byte arrays lexicographically over the specified ranges, numerically treating elements as unsigned.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Byte.compareUnsigned(byte, byte), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(byte[], int, int, byte[], int, int) for the definition of a common and proper prefix.)

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Byte.compareUnsigned(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(short[] a, short[] b)
      Compares two short arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Short.compare(short, short), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(short[], short[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Short.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
      Compares two short arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Short.compare(short, short), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(short[], int, int, short[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Short.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(short[] a, short[] b)
      Compares two short arrays lexicographically, numerically treating elements as unsigned.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Short.compareUnsigned(short, short), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(short[], short[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Short.compareUnsigned(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
      Compares two short arrays lexicographically over the specified ranges, numerically treating elements as unsigned.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Short.compareUnsigned(short, short), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(short[], int, int, short[], int, int) for the definition of a common and proper prefix.)

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Short.compareUnsigned(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(char[] a, char[] b)
      Compares two char arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Character.compare(char, char), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(char[], char[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Character.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
      Compares two char arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Character.compare(char, char), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(char[], int, int, char[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Character.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(int[] a, int[] b)
      Compares two int arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Integer.compare(int, int), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(int[], int[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Integer.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
      Compares two int arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Integer.compare(int, int), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(int[], int, int, int[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Integer.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(int[] a, int[] b)
      Compares two int arrays lexicographically, numerically treating elements as unsigned.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Integer.compareUnsigned(int, int), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(int[], int[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Integer.compareUnsigned(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
      Compares two int arrays lexicographically over the specified ranges, numerically treating elements as unsigned.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Integer.compareUnsigned(int, int), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(int[], int, int, int[], int, int) for the definition of a common and proper prefix.)

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Integer.compareUnsigned(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(long[] a, long[] b)
      Compares two long arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Long.compare(long, long), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(long[], long[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Long.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
      Compares two long arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Long.compare(long, long), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(long[], int, int, long[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Long.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(long[] a, long[] b)
      Compares two long arrays lexicographically, numerically treating elements as unsigned.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Long.compareUnsigned(long, long), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(long[], long[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Long.compareUnsigned(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compareUnsigned

      public static int compareUnsigned​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
      Compares two long arrays lexicographically over the specified ranges, numerically treating elements as unsigned.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Long.compareUnsigned(long, long), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(long[], int, int, long[], int, int) for the definition of a common and proper prefix.)

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Long.compareUnsigned(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(float[] a, float[] b)
      Compares two float arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Float.compare(float, float), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(float[], float[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Float.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
      Compares two float arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Float.compare(float, float), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(float[], int, int, float[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Float.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static int compare​(double[] a, double[] b)
      Compares two double arrays lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Double.compare(double, double), at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(double[], double[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return Double.compare(a[i], b[i]);
           return a.length - b.length;
       

      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static int compare​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
      Compares two double arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements, as if by Double.compare(double, double), at a relative index within the respective arrays that is the length of the prefix. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(double[], int, int, double[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if:

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return Double.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static <T extends Comparable<? super T>> int compare​(T[] a, T[] b)
      Compares two Object arrays, within comparable elements, lexicographically.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing two elements of type T at an index i within the respective arrays that is the prefix length, as if by:

      
           Comparator.nullsFirst(Comparator.<T>naturalOrder()).
               compare(a[i], b[i])
       
      Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(Object[], Object[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal. A null array element is considered lexicographically less than a non-null array element. Two null array elements are considered equal.

      The comparison is consistent with equals, more specifically the following holds for arrays a and b:

      
           Arrays.equals(a, b) == (Arrays.compare(a, b) == 0)
       

      API Note:

      This method behaves as if (for non-null array references and elements):

      
           int i = Arrays.mismatch(a, b);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return a[i].compareTo(b[i]);
           return a.length - b.length;
       

      Type Parameters:
      T - the type of comparable array elements
      Parameters:
      a - the first array to compare
      b - the second array to compare
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Since:
      9
    • compare

      public static <T extends Comparable<? super T>> int compare​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex)
      Compares two Object arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing two elements of type T at a relative index i within the respective arrays that is the prefix length, as if by:

      
           Comparator.nullsFirst(Comparator.<T>naturalOrder()).
               compare(a[aFromIndex + i, b[bFromIndex + i])
       
      Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(Object[], int, int, Object[], int, int) for the definition of a common and proper prefix.)

      The comparison is consistent with equals, more specifically the following holds for arrays a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively:

      
           Arrays.equals(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) ==
               (Arrays.compare(a, aFromIndex, aToIndex, b, bFromIndex, bToIndex) == 0)
       

      API Note:

      This method behaves as if (for non-null array elements):

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return a[aFromIndex + i].compareTo(b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Type Parameters:
      T - the type of comparable array elements
      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • compare

      public static <T> int compare​(T[] a, T[] b, Comparator<? super T> cmp)
      Compares two Object arrays lexicographically using a specified comparator.

      If the two arrays share a common prefix then the lexicographic comparison is the result of comparing with the specified comparator two elements at an index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two array lengths. (See mismatch(Object[], Object[]) for the definition of a common and proper prefix.)

      A null array reference is considered lexicographically less than a non-null array reference. Two null array references are considered equal.

      API Note:

      This method behaves as if (for non-null array references):

      
           int i = Arrays.mismatch(a, b, cmp);
           if (i >= 0 && i < Math.min(a.length, b.length))
               return cmp.compare(a[i], b[i]);
           return a.length - b.length;
       

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - the first array to compare
      b - the second array to compare
      cmp - the comparator to compare array elements
      Returns:
      the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array
      Throws:
      NullPointerException - if the comparator is null
      Since:
      9
    • compare

      public static <T> int compare​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
      Compares two Object arrays lexicographically over the specified ranges.

      If the two arrays, over the specified ranges, share a common prefix then the lexicographic comparison is the result of comparing with the specified comparator two elements at a relative index within the respective arrays that is the prefix length. Otherwise, one array is a proper prefix of the other and, lexicographic comparison is the result of comparing the two range lengths. (See mismatch(Object[], int, int, Object[], int, int) for the definition of a common and proper prefix.)

      API Note:

      This method behaves as if (for non-null array elements):

      
           int i = Arrays.mismatch(a, aFromIndex, aToIndex,
                                   b, bFromIndex, bToIndex, cmp);
           if (i >= 0 && i < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
               return cmp.compare(a[aFromIndex + i], b[bFromIndex + i]);
           return (aToIndex - aFromIndex) - (bToIndex - bFromIndex);
       

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - the first array to compare
      aFromIndex - the index (inclusive) of the first element in the first array to be compared
      aToIndex - the index (exclusive) of the last element in the first array to be compared
      b - the second array to compare
      bFromIndex - the index (inclusive) of the first element in the second array to be compared
      bToIndex - the index (exclusive) of the last element in the second array to be compared
      cmp - the comparator to compare array elements
      Returns:
      the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array or the comparator is null
      Since:
      9
    • mismatch

      public static int mismatch​(boolean[] a, boolean[] b)
      Finds and returns the index of the first mismatch between two boolean arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two boolean arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(byte[] a, byte[] b)
      Finds and returns the index of the first mismatch between two byte arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two byte arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(char[] a, char[] b)
      Finds and returns the index of the first mismatch between two char arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(char[] a, int aFromIndex, int aToIndex, char[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two char arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(short[] a, short[] b)
      Finds and returns the index of the first mismatch between two short arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(short[] a, int aFromIndex, int aToIndex, short[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two short arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(int[] a, int[] b)
      Finds and returns the index of the first mismatch between two int arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two int arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(long[] a, long[] b)
      Finds and returns the index of the first mismatch between two long arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           a[pl] != b[pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(long[] a, int aFromIndex, int aToIndex, long[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two long arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           a[aFromIndex + pl] != b[bFromIndex + pl]
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(float[] a, float[] b)
      Finds and returns the index of the first mismatch between two float arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           Float.compare(a[pl], b[pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(float[] a, int aFromIndex, int aToIndex, float[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two float arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           Float.compare(a[aFromIndex + pl], b[bFromIndex + pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(double[] a, double[] b)
      Finds and returns the index of the first mismatch between two double arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           Double.compare(a[pl], b[pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(double[] a, int aFromIndex, int aToIndex, double[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two double arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           Double.compare(a[aFromIndex + pl], b[bFromIndex + pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(Object[] a, Object[] b)
      Finds and returns the index of the first mismatch between two Object arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl) &&
           !Objects.equals(a[pl], b[pl])
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length))
       

      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static int mismatch​(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex)
      Finds and returns the relative index of the first mismatch between two Object arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl) &&
           !Objects.equals(a[aFromIndex + pl], b[bFromIndex + pl])
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex))
       

      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array is null
      Since:
      9
    • mismatch

      public static <T> int mismatch​(T[] a, T[] b, Comparator<? super T> cmp)
      Finds and returns the index of the first mismatch between two Object arrays, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller array.

      The specified comparator is used to determine if two array elements from the each array are not equal.

      If the two arrays share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two elements at that index within the respective arrays. If one array is a proper prefix of the other then the returned index is the length of the smaller array and it follows that the index is only valid for the larger array. Otherwise, there is no mismatch.

      Two non-null arrays, a and b, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(a.length, b.length) &&
           Arrays.equals(a, 0, pl, b, 0, pl, cmp)
           cmp.compare(a[pl], b[pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b, share a proper prefix if the following expression is true:

      
           a.length != b.length &&
           Arrays.equals(a, 0, Math.min(a.length, b.length),
                         b, 0, Math.min(a.length, b.length),
                         cmp)
       

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - the first array to be tested for a mismatch
      b - the second array to be tested for a mismatch
      cmp - the comparator to compare array elements
      Returns:
      the index of the first mismatch between the two arrays, otherwise -1.
      Throws:
      NullPointerException - if either array or the comparator is null
      Since:
      9
    • mismatch

      public static <T> int mismatch​(T[] a, int aFromIndex, int aToIndex, T[] b, int bFromIndex, int bToIndex, Comparator<? super T> cmp)
      Finds and returns the relative index of the first mismatch between two Object arrays over the specified ranges, otherwise return -1 if no mismatch is found. The index will be in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.

      If the two arrays, over the specified ranges, share a common prefix then the returned relative index is the length of the common prefix and it follows that there is a mismatch between the two elements at that relative index within the respective arrays. If one array is a proper prefix of the other, over the specified ranges, then the returned relative index is the length of the smaller range and it follows that the relative index is only valid for the array with the larger range. Otherwise, there is no mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a common prefix of length pl if the following expression is true:

      
           pl >= 0 &&
           pl < Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex) &&
           Arrays.equals(a, aFromIndex, aFromIndex + pl, b, bFromIndex, bFromIndex + pl, cmp) &&
           cmp.compare(a[aFromIndex + pl], b[bFromIndex + pl]) != 0
       
      Note that a common prefix length of 0 indicates that the first elements from each array mismatch.

      Two non-null arrays, a and b with specified ranges [aFromIndex, atoIndex) and [bFromIndex, btoIndex) respectively, share a proper prefix if the following expression is true:

      
           (aToIndex - aFromIndex) != (bToIndex - bFromIndex) &&
           Arrays.equals(a, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         b, 0, Math.min(aToIndex - aFromIndex, bToIndex - bFromIndex),
                         cmp)
       

      Type Parameters:
      T - the type of array elements
      Parameters:
      a - the first array to be tested for a mismatch
      aFromIndex - the index (inclusive) of the first element in the first array to be tested
      aToIndex - the index (exclusive) of the last element in the first array to be tested
      b - the second array to be tested for a mismatch
      bFromIndex - the index (inclusive) of the first element in the second array to be tested
      bToIndex - the index (exclusive) of the last element in the second array to be tested
      cmp - the comparator to compare array elements
      Returns:
      the relative index of the first mismatch between the two arrays over the specified ranges, otherwise -1.
      Throws:
      IllegalArgumentException - if aFromIndex > aToIndex or if bFromIndex > bToIndex
      ArrayIndexOutOfBoundsException - if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length
      NullPointerException - if either array or the comparator is null
      Since:
      9