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java.util
Class Vector<E>
java.lang.Object
java.util.AbstractCollection<E>
java.util.AbstractList<E>
java.util.Vector<E>
-
All Implemented Interfaces:
-
Serializable
,
Cloneable
,
Iterable
<E>,
Collection
<E>,
List
<E>,
RandomAccess
-
Direct Known Subclasses:
-
Stack
-
public class Vector<E>
- extends AbstractList<E>
- implements List<E>, RandomAccess, Cloneable, Serializable
The Vector class implements a growable array of objects. Like an array, it contains components that can be accessed using an integer index. However, the size of a Vector can grow or shrink as needed to accommodate adding and removing items after the Vector has been created.
Each vector tries to optimize storage management by maintaining a capacity and a capacityIncrement. The capacity is always at least as large as the vector size; it is usually larger because as components are added to the vector, the vector's storage increases in chunks the size of capacityIncrement. An application can increase the capacity of a vector before inserting a large number of components; this reduces the amount of incremental reallocation.
As of the Java 2 platform v1.2, this class has been retrofitted to implement List, so that it becomes a part of Java's collection framework. Unlike the new collection implementations, Vector is synchronized.
The Iterators returned by Vector's iterator and listIterator methods are fail-fast: if the Vector is structurally modified at any time after the Iterator is created, in any way except through the Iterator's own remove or add methods, the Iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the Iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future. The Enumerations returned by Vector's elements method are not fail-fast.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw
ConcurrentModificationException
on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness:
the fail-fast behavior of iterators should be used only to detect bugs.
This class is a member of the
Java Collections Framework
.
-
Since:
-
JDK1.0
-
See Also:
-
Collection
,
List
,
ArrayList
,
LinkedList
,
Serialized Form
Field Summary
|
protected int |
capacityIncrement
The amount by which the capacity of the vector is automatically incremented when its size becomes greater than its capacity. |
protected int |
elementCount
The number of valid components in this
Vector
object. |
protected
Object
[] |
elementData
The array buffer into which the components of the vector are stored. |
Constructor Summary
|
Vector
()
Constructs an empty vector so that its internal data array has size
10
and its standard capacity increment is zero. |
Vector
(
Collection
<? extends
E
> c)
Constructs a vector containing the elements of the specified collection, in the order they are returned by the collection's iterator. |
Vector
(int initialCapacity)
Constructs an empty vector with the specified initial capacity and with its capacity increment equal to zero. |
Vector
(int initialCapacity, int capacityIncrement)
Constructs an empty vector with the specified initial capacity and capacity increment. |
Method Summary
|
boolean |
add
(
E
Appends the specified element to the end of this Vector. |
void |
add
(int index,
E
element)
Inserts the specified element at the specified position in this Vector. |
boolean |
addAll
(
Collection
<? extends
E
> c)
Appends all of the elements in the specified Collection to the end of this Vector, in the order that they are returned by the specified Collection's Iterator. |
boolean |
addAll
(int index,
Collection
<? extends
E
> c)
Inserts all of the elements in the specified Collection into this Vector at the specified position. |
void |
addElement
(
E
Adds the specified component to the end of this vector, increasing its size by one. |
int |
capacity
()
Returns the current capacity of this vector. |
void |
clear
()
Removes all of the elements from this Vector. |
Object
|
clone
()
Returns a clone of this vector. |
boolean |
contains
(
Object
Returns
true
Tests
if
this vector contains
the specified
element.
object is a component in this vector.
|
boolean |
containsAll
(
Collection
<?> c)
Returns true if this Vector contains all of the elements in the specified Collection. |
void |
copyInto
(
Object
[] anArray)
Copies the components of this vector into the specified array. |
E
|
elementAt
(int index)
Returns the component at the specified index. |
Enumeration
<
E
> |
elements
()
Returns an enumeration of the components of this vector. |
void |
ensureCapacity
(int minCapacity)
Increases the capacity of this vector, if necessary, to ensure that it can hold at least the number of components specified by the minimum capacity argument. |
boolean |
equals
(
Object
o)
Compares the specified Object with this Vector for equality. |
E
|
firstElement
()
Returns the first component (the item at index
0
) of this vector. |
E
|
get
(int index)
Returns the element at the specified position in this Vector. |
int |
hashCode
()
Returns the hash code value for this Vector. |
int |
indexOf
(
Object
Returns
Searches for
the
index of the
first
occurrence
occurence
of the
specified element in this vector, or -1 if this vector does not contain
given argument, testing for equality using
the
element.
equals method.
|
int
|
indexOf
(
Object
Returns the index of the first occurrence of the specified element in this vector, searching forwards from
index
, or returns -1 if the element is not found.
|
int
|
indexOf
(
Object
Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
|
void |
insertElementAt
(
E
Inserts the specified object as a component in this vector at the specified index. |
boolean |
isEmpty
()
Tests if this vector has no components. |
E
|
lastElement
()
Returns the last component of the vector. |
int |
lastIndexOf
(
Object
Returns the index of the last occurrence of the specified
element
object
in this
vector, or -1 if this vector does not contain the element.
vector.
|
int
|
lastIndexOf
(
Object
Returns the index of the last occurrence of the specified element in this vector, searching backwards from
index
, or returns -1 if the element is not found.
|
int
|
lastIndexOf
(
Object
Searches backwards for the specified object, starting from the specified index, and returns an index to it.
|
E
|
remove
(int index)
Removes the element at the specified position in this Vector. |
boolean |
remove
(
Object
o)
Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged. |
boolean |
removeAll
(
Collection
<?> c)
Removes from this Vector all of its elements that are contained in the specified Collection. |
void |
removeAllElements
()
Removes all components from this vector and sets its size to zero. |
boolean |
removeElement
(
Object
Removes the first (lowest-indexed) occurrence of the argument from this vector. |
void |
removeElementAt
(int index)
Deletes the component at the specified index. |
protected void |
removeRange
(int fromIndex, int toIndex)
Removes from this List all of the elements whose index is between fromIndex, inclusive and toIndex, exclusive. |
boolean |
retainAll
(
Collection
<?> c)
Retains only the elements in this Vector that are contained in the specified Collection. |
E
|
set
(int index,
E
element)
Replaces the element at the specified position in this Vector with the specified element. |
void |
setElementAt
(
E
Sets the component at the specified index of this vector to be the specified object. |
void |
setSize
(int newSize)
Sets the size of this vector. |
int |
size
()
Returns the number of components in this vector. |
List
<
E
> |
subList
(int fromIndex, int toIndex)
Returns a view of the portion of this List between fromIndex, inclusive, and toIndex, exclusive. |
Object
[] |
toArray
()
Returns an array containing all of the elements in this Vector in the correct order. |
|
toArray
(T[] a)
Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array. |
String
|
toString
()
Returns a string representation of this Vector, containing the String representation of each element. |
void |
trimToSize
()
Trims the capacity of this vector to be the vector's current size. |
elementData
protected Object[] elementData
-
The array buffer into which the components of the vector are stored. The capacity of the vector is the length of this array buffer, and is at least large enough to contain all the vector's elements.
Any array elements following the last element in the Vector are null.
elementCount
protected int elementCount
-
The number of valid components in this
Vector
object. Components
elementData[0]
through
elementData[elementCount-1]
are the actual items.
capacityIncrement
protected int capacityIncrement
-
The amount by which the capacity of the vector is automatically incremented when its size becomes greater than its capacity. If the capacity increment is less than or equal to zero, the capacity of the vector is doubled each time it needs to grow.
Vector
public Vector(int initialCapacity,
int capacityIncrement)
-
Constructs an empty vector with the specified initial capacity and capacity increment.
-
Parameters:
-
initialCapacity - the initial capacity of the
vector
vector.
-
capacityIncrement - the amount by which the capacity is increased when the vector
overflows
overflows.
-
Throws:
-
IllegalArgumentException
- if the specified initial capacity is negative
Vector
public Vector(int initialCapacity)
-
Constructs an empty vector with the specified initial capacity and with its capacity increment equal to zero.
-
Parameters:
-
initialCapacity - the initial capacity of the
vector
vector.
-
Throws:
-
IllegalArgumentException
- if the specified initial capacity is negative
Vector
public Vector()
-
Constructs an empty vector so that its internal data array has size
10
and its standard capacity increment is zero.
Vector
public Vector(Collection<? extends E> c)
-
Constructs a vector containing the elements of the specified collection, in the order they are returned by the collection's iterator.
-
Parameters:
-
c - the collection whose elements are to be placed into this
vector
vector.
-
Throws:
-
NullPointerException
- if the specified collection is
null
null.
-
Since:
-
1.2
copyInto
public void copyInto(Object[] anArray)
-
Copies the components of this vector into the specified array. The item at index
k
in this vector is copied into component
k
of
anArray
.
The array must be big enough to hold all the objects in this vector, else an
IndexOutOfBoundsException
is thrown.
-
-
-
Parameters:
-
anArray - the array into which the components get
copied
copied.
-
Throws:
-
NullPointerException
- if the given array is null
-
IndexOutOfBoundsException
- if the specified array is not large enough to hold all the components of this vector
-
ArrayStoreException
- if a component of this vector is not of a runtime type that can be stored in the specified array
-
See Also:
-
toArray(Object[])
- if the given array is null.
trimToSize
public void trimToSize()
-
Trims the capacity of this vector to be the vector's current size. If the capacity of this vector is larger than its current size, then the capacity is changed to equal the size by replacing its internal data array, kept in the field
elementData
, with a smaller one. An application can use this operation to minimize the storage of a vector.
-
-
ensureCapacity
public void ensureCapacity(int minCapacity)
-
Increases the capacity of this vector, if necessary, to ensure that it can hold at least the number of components specified by the minimum capacity argument.
If the current capacity of this vector is less than
minCapacity
, then its capacity is increased by replacing its internal data array, kept in the field
elementData
, with a larger one. The size of the new data array will be the old size plus
capacityIncrement
, unless the value of
capacityIncrement
is less than or equal to zero, in which case the new capacity will be twice the old capacity; but if this new size is still smaller than
minCapacity
, then the new capacity will be
minCapacity
.
-
-
-
Parameters:
-
minCapacity - the desired minimum
capacity
capacity.
setSize
public void setSize(int newSize)
-
Sets the size of this vector. If the new size is greater than the current size, new null items are added to the end of the vector. If the new size is less than the current size, all components at index newSize and greater are discarded.
-
-
-
Parameters:
-
newSize - the new size of this
vector
vector.
-
Throws:
-
ArrayIndexOutOfBoundsException
- if new size is
negative
negative.
capacity
public int capacity()
-
Returns the current capacity of this vector.
-
-
-
Returns:
-
the current capacity (the length of its internal data array, kept in the field
elementData
of this
vector)
vector).
size
public int size()
-
Returns the number of components in this vector.
-
-
Specified by:
-
size
in interface
Collection
<
E
>
-
Specified by:
-
size
in interface
List
<
E
>
-
Specified by:
-
size
in class
AbstractCollection
<
E
>
-
-
Returns:
-
the number of components in this
vector
vector.
isEmpty
public boolean isEmpty()
-
Tests if this vector has no components.
-
-
Specified by:
-
isEmpty
in interface
Collection
<
E
>
-
Specified by:
-
isEmpty
in interface
List
<
E
>
-
Overrides:
-
isEmpty
in class
AbstractCollection
<
E
>
-
-
Returns:
-
true if and only if this vector has no components, that is, its size is zero; false otherwise.
elements
public Enumeration<E> elements()
-
Returns an enumeration of the components of this vector. The returned
Enumeration
object will generate all items in this vector. The first item generated is the item at index
0
, then the item at index
1
, and so on.
-
-
-
Returns:
-
an enumeration of the components of this
vector
vector.
-
See Also:
-
Enumeration
,
Iterator
contains
public boolean contains(Object o) elem)
-
Returns
true
if this vector contains the specified element. More formally, returns
true
if and only if this vector contains at least one element
e
such that
(o==null ? e==null : o.equals(e))
.
Tests if the specified object is a component in this vector.
-
-
Specified by:
-
contains
in interface
Collection
<
E
>
-
Specified by:
-
contains
in interface
List
<
E
>
-
Overrides:
-
contains
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
o - element whose presence in this vector is to be tested
elem - an object.
-
Returns:
-
true if and only if the specified object is the same as a component in this vector, as determined by the
true
equals
if this vector contains the specified element
method; false otherwise.
indexOf
public int indexOf(Object o) elem)
-
Returns the index of the first occurrence of the specified element in this vector, or -1 if this vector does not contain the element. More formally, returns the lowest index
i
such that
(o==null ? get(i)==null : o.equals(get(i)))
, or -1 if there is no such index.
Searches for the first occurence of the given argument, testing for equality using the equals method.
-
-
Specified by:
-
indexOf
in interface
List
<
E
>
-
Overrides:
-
indexOf
in class
AbstractList
<
E
>
-
-
Parameters:
-
o - element to search for
elem - an object.
-
Returns:
-
the index of the first occurrence of the specified element in this vector, or -1 if this vector does not contain the element
the index of the first occurrence of the argument in this vector, that is, the smallest value
k
such that
elem.equals(elementData[k])
is
true
; returns -1 if the object is not found.
-
See Also:
-
Object.equals(Object)
indexOf
public int indexOf(Object o,
elem,
int index)
-
Returns the index of the first occurrence of the specified element in this vector, searching forwards from
index
, or returns -1 if the element is not found. More formally, returns the lowest index
i
such that
(i >= index && (o==null ? get(i)==null : o.equals(get(i))))
, or -1 if there is no such index.
Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
-
-
-
Parameters:
-
o - element to search for
elem - an object.
-
index -
the non-negative
index to start searching
from
from.
-
Returns:
-
the index of the first occurrence of the
element
object argument
in this vector at position
index or later in the vector, that is, the smallest value
k
such that
elem.equals(elementData[k]) && (k >= index)
is
true
; returns -1 if the object is not found. (Returns -1 if
index
or later in the vector;
>= the current size of this
-1
Vector
if the element is not found.
.)
-
Throws:
-
IndexOutOfBoundsException
- if
the specified
index
is
negative
negative.
-
See Also:
-
Object.equals(Object)
lastIndexOf
public int lastIndexOf(Object o) elem)
-
Returns the index of the last occurrence of the specified element in this vector, or -1 if this vector does not contain the element. More formally, returns the highest index
i
such that
(o==null ? get(i)==null : o.equals(get(i)))
, or -1 if there is no such index.
Returns the index of the last occurrence of the specified object in this vector.
-
-
Specified by:
-
lastIndexOf
in interface
List
<
E
>
-
Overrides:
-
lastIndexOf
in class
AbstractList
<
E
>
-
-
Parameters:
-
o - element to search for
elem - the desired component.
-
Returns:
-
the index of the last occurrence of the specified element in this vector, or -1 if this vector does not contain the element
the index of the last occurrence of the specified object in this vector, that is, the largest value
k
such that
elem.equals(elementData[k])
is
true
; returns -1 if the object is not found.
lastIndexOf
public int lastIndexOf(Object o,
elem,
int index)
-
Returns the index of the last occurrence of the specified element in this vector, searching backwards from
index
, or returns -1 if the element is not found. More formally, returns the highest index
i
such that
(i <= index && (o==null ? get(i)==null : o.equals(get(i))))
, or -1 if there is no such index.
Searches backwards for the specified object, starting from the specified index, and returns an index to it.
-
-
-
Parameters:
-
o - element to search for
elem - the desired component.
-
index -
the
index to start searching
backwards from
from.
-
Returns:
-
the index of the last occurrence of the
element
specified object in this vector
at position less than or equal to
index in the vector, that is, the largest value
k
such that
elem.equals(elementData[k]) && (k <= index)
is
true
; -1 if the object is not found. (Returns -1 if
index
in this vector; -1 if the element is not found.
is negative.)
-
Throws:
-
IndexOutOfBoundsException
- if
the specified
index
is greater than or equal to the current size of this
vector
vector.
elementAt
public E elementAt(int index)
-
Returns the component at the specified index.
This method is identical in functionality to the get method (which is part of the List interface).
-
-
-
Parameters:
-
index - an index into this
vector
vector.
-
Returns:
-
the component at the specified
index
index.
-
Throws:
-
ArrayIndexOutOfBoundsException
- if the
index
is negative or not less than the current size of this
Vector
object.
given.
-
See Also:
-
get(int)
,
List
firstElement
public E firstElement()
-
Returns the first component (the item at index
0
) of this vector.
-
-
-
Returns:
-
the first component of this
vector
vector.
-
Throws:
-
NoSuchElementException
- if this vector has no
components
components.
lastElement
public E lastElement()
-
Returns the last component of the vector.
-
-
-
Returns:
-
the last component of the vector, i.e., the component at index size() - 1.
-
Throws:
-
NoSuchElementException
- if this vector is
empty
empty.
setElementAt
public void setElementAt(E obj,
int index)
-
Sets the component at the specified index of this vector to be the specified object. The previous component at that position is discarded.
The index must be a value greater than or equal to 0 and less than the current size of the vector.
This method is identical in functionality to the set method (which is part of the List interface). Note that the set method reverses the order of the parameters, to more closely match array usage. Note also that the set method returns the old value that was stored at the specified position.
-
-
-
Parameters:
-
obj - what the component is to be set
to
to.
-
index - the specified
index
index.
-
Throws:
-
ArrayIndexOutOfBoundsException
- if the index was
invalid
invalid.
-
See Also:
-
size()
,
List
,
set(int, java.lang.Object)
removeElementAt
public void removeElementAt(int index)
-
Deletes the component at the specified index. Each component in this vector with an index greater or equal to the specified index is shifted downward to have an index one smaller than the value it had previously. The size of this vector is decreased by
1
.
The index must be a value greater than or equal to 0 and less than the current size of the vector.
This method is identical in functionality to the remove method (which is part of the List interface). Note that the remove method returns the old value that was stored at the specified position.
-
-
-
Parameters:
-
index - the index of the object to
remove
remove.
-
Throws:
-
ArrayIndexOutOfBoundsException
- if the index was
invalid
invalid.
-
See Also:
-
size()
,
remove(int)
,
List
insertElementAt
public void insertElementAt(E obj,
int index)
-
Inserts the specified object as a component in this vector at the specified index. Each component in this vector with an index greater or equal to the specified index is shifted upward to have an index one greater than the value it had previously.
The index must be a value greater than or equal to 0 and less than or equal to the current size of the vector. (If the index is equal to the current size of the vector, the new element is appended to the Vector.)
This method is identical in functionality to the add(Object, int) method (which is part of the List interface). Note that the add method reverses the order of the parameters, to more closely match array usage.
-
-
-
Parameters:
-
obj - the component to
insert
insert.
-
index - where to insert the new
component
component.
-
Throws:
-
ArrayIndexOutOfBoundsException
- if the index was
invalid
invalid.
-
See Also:
-
size()
,
add(int, Object)
,
List
addElement
public void addElement(E obj)
-
Adds the specified component to the end of this vector, increasing its size by one. The capacity of this vector is increased if its size becomes greater than its capacity.
This method is identical in functionality to the add(Object) method (which is part of the List interface).
-
-
-
Parameters:
-
obj - the component to be
added
added.
-
See Also:
-
add(Object)
,
List
removeElement
public boolean removeElement(Object obj)
-
Removes the first (lowest-indexed) occurrence of the argument from this vector. If the object is found in this vector, each component in the vector with an index greater or equal to the object's index is shifted downward to have an index one smaller than the value it had previously.
This method is identical in functionality to the remove(Object) method (which is part of the List interface).
-
-
-
Parameters:
-
obj - the component to be
removed
removed.
-
Returns:
-
true if the argument was a component of this vector; false otherwise.
-
See Also:
-
List.remove(Object)
,
List
removeAllElements
public void removeAllElements()
-
Removes all components from this vector and sets its size to zero.
This method is identical in functionality to the clear method (which is part of the List interface).
-
-
-
See Also:
-
clear()
,
List
clone
public Object clone()
-
Returns a clone of this vector. The copy will contain a reference to a clone of the internal data array, not a reference to the original internal data array of this
Vector
object.
-
-
Overrides:
-
clone
in class
Object
-
-
Returns:
-
a clone of this
vector
vector.
-
See Also:
-
Cloneable
toArray
public Object[] toArray()
-
Returns an array containing all of the elements in this Vector in the correct order.
-
-
Specified by:
-
toArray
in interface
Collection
<
E
>
-
Specified by:
-
toArray
in interface
List
<
E
>
-
Overrides:
-
toArray
in class
AbstractCollection
<
E
>
-
-
Returns:
-
an array containing all of the elements in this
collection
collection.
-
Since:
-
1.2
-
See Also:
-
Arrays.asList(Object[])
toArray
public <T> T[] toArray(T[] a)
-
Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array. If the Vector fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this Vector.
If the Vector fits in the specified array with room to spare (i.e., the array has more elements than the Vector), the element in the array immediately following the end of the Vector is set to null.
(This
This
is useful in determining the length of the Vector only if the caller knows that the Vector does not contain any null
elements.)
elements.
-
-
Specified by:
-
toArray
in interface
Collection
<
E
>
-
Specified by:
-
toArray
in interface
List
<
E
>
-
Overrides:
-
toArray
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
a - the array into which the elements of the Vector are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
-
Returns:
-
an array containing the elements of the
Vector
Vector.
-
Throws:
-
ArrayStoreException
- the runtime type of a is not a supertype of the runtime type of every element in this
Vector
Vector.
-
NullPointerException
- if the given array is
null
null.
-
Since:
-
1.2
get
public E get(int index)
-
Returns the element at the specified position in this Vector.
-
-
Specified by:
-
get
in interface
List
<
E
>
-
Specified by:
-
get
in class
AbstractList
<
E
>
-
-
Parameters:
-
index - index of
the
element to
return
return.
-
Returns:
-
object at the specified index
-
Throws:
-
ArrayIndexOutOfBoundsException
- index is out of range (index < 0 || index >=
size())
size()).
-
Since:
-
1.2
set
public E set(int index,
E element)
-
Replaces the element at the specified position in this Vector with the specified element.
-
-
Specified by:
-
set
in interface
List
<
E
>
-
Overrides:
-
set
in class
AbstractList
<
E
>
-
-
Parameters:
-
index - index of
the
element to
replace
replace.
-
element - element to be stored at the specified
position
position.
-
Returns:
-
the element previously at the specified
position
position.
-
Throws:
-
ArrayIndexOutOfBoundsException
- index out of range (index < 0 || index >=
size())
size()).
-
Since:
-
1.2
add
public boolean add(E e) o)
-
Appends the specified element to the end of this Vector.
-
-
Specified by:
-
add
in interface
Collection
<
E
>
-
Specified by:
-
add
in interface
List
<
E
>
-
Overrides:
-
add
in class
AbstractList
<
E
>
-
-
Parameters:
-
e
o
- element to be appended to this
Vector
Vector.
-
Returns:
-
true
(as specified by
Collection.add(E)
)
true (as per the general contract of Collection.add).
-
Since:
-
1.2
remove
public boolean remove(Object o)
-
Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such an element exists).
-
-
Specified by:
-
remove
in interface
Collection
<
E
>
-
Specified by:
-
remove
in interface
List
<
E
>
-
Overrides:
-
remove
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
o - element to be removed from this Vector, if
present
present.
-
Returns:
-
true if the Vector contained the specified
element
element.
-
Since:
-
1.2
add
public void add(int index,
E element)
-
Inserts the specified element at the specified position in this Vector. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).
-
-
Specified by:
-
add
in interface
List
<
E
>
-
Overrides:
-
add
in class
AbstractList
<
E
>
-
-
Parameters:
-
index - index at which the specified element is to be
inserted
inserted.
-
element - element to be
inserted
inserted.
-
Throws:
-
ArrayIndexOutOfBoundsException
- index is out of range (index < 0 || index >
size())
size()).
-
Since:
-
1.2
remove
public E remove(int index)
-
Removes the element at the specified position in this Vector.
Shifts
shifts
any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the Vector.
-
-
Specified by:
-
remove
in interface
List
<
E
>
-
Overrides:
-
remove
in class
AbstractList
<
E
>
-
-
Parameters:
-
index - the index of the element to
be removed
removed.
-
Returns:
-
element that was removed
-
Throws:
-
ArrayIndexOutOfBoundsException
- index out of range (index < 0 || index >=
size())
size()).
-
Since:
-
1.2
clear
public void clear()
-
Removes all of the elements from this Vector. The Vector will be empty after this call returns (unless it throws an exception).
-
-
Specified by:
-
clear
in interface
Collection
<
E
>
-
Specified by:
-
clear
in interface
List
<
E
>
-
Overrides:
-
clear
in class
AbstractList
<
E
>
-
-
Since:
-
1.2
containsAll
public boolean containsAll(Collection<?> c)
-
Returns true if this Vector contains all of the elements in the specified Collection.
-
-
Specified by:
-
containsAll
in interface
Collection
<
E
>
-
Specified by:
-
containsAll
in interface
List
<
E
>
-
Overrides:
-
containsAll
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
c - a collection whose elements will be tested for containment in this Vector
-
Returns:
-
true if this Vector contains all of the elements in the specified
collection
collection.
-
Throws:
-
NullPointerException
- if the specified collection is
null
null.
-
See Also:
-
AbstractCollection.contains(Object)
addAll
public boolean addAll(Collection<? extends E> c)
-
Appends all of the elements in the specified Collection to the end of this Vector, in the order that they are returned by the specified Collection's Iterator. The behavior of this operation is undefined if the specified Collection is modified while the operation is in progress. (This implies that the behavior of this call is undefined if the specified Collection is this Vector, and this Vector is nonempty.)
-
-
Specified by:
-
addAll
in interface
Collection
<
E
>
-
Specified by:
-
addAll
in interface
List
<
E
>
-
Overrides:
-
addAll
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
c - elements to be inserted into this
Vector
Vector.
-
Returns:
-
true
if this Vector changed as a result of the
call
call.
-
Throws:
-
NullPointerException
- if the specified collection is
null
null.
-
Since:
-
1.2
-
See Also:
-
AbstractCollection.add(Object)
removeAll
public boolean removeAll(Collection<?> c)
-
Removes from this Vector all of its elements that are contained in the specified Collection.
-
-
Specified by:
-
removeAll
in interface
Collection
<
E
>
-
Specified by:
-
removeAll
in interface
List
<
E
>
-
Overrides:
-
removeAll
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
c - a collection of elements to be removed from the Vector
-
Returns:
-
true if this Vector changed as a result of the
call
call.
-
Throws:
-
ClassCastException
- if the types of one or more elements in this vector are incompatible with the specified collection (optional)
-
NullPointerException
- if this vector contains one or more null elements and the specified collection does not support null elements (optional), or if the specified collection is null
- if the specified collection is null.
-
Since:
-
1.2
-
See Also:
-
AbstractCollection.remove(Object)
,
AbstractCollection.contains(Object)
retainAll
public boolean retainAll(Collection<?> c)
-
Retains only the elements in this Vector that are contained in the specified Collection. In other words, removes from this Vector all of its elements that are not contained in the specified Collection.
-
-
Specified by:
-
retainAll
in interface
Collection
<
E
>
-
Specified by:
-
retainAll
in interface
List
<
E
>
-
Overrides:
-
retainAll
in class
AbstractCollection
<
E
>
-
-
Parameters:
-
c - a collection of elements to be retained in this Vector (all other elements are removed)
-
Returns:
-
true if this Vector changed as a result of the
call
call.
-
Throws:
-
ClassCastException
- if the types of one or more elements in this vector are incompatible with the specified collection (optional)
-
NullPointerException
- if this vector contains one or more null elements and the specified collection does not support null elements (optional), or if the specified collection is null
- if the specified collection is null.
-
Since:
-
1.2
-
See Also:
-
AbstractCollection.remove(Object)
,
AbstractCollection.contains(Object)
addAll
public boolean addAll(int index,
Collection<? extends E> c)
-
Inserts all of the elements in the specified Collection into this Vector at the specified position. Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in the Vector in the order that they are returned by the specified Collection's iterator.
-
-
Specified by:
-
addAll
in interface
List
<
E
>
-
Overrides:
-
addAll
in class
AbstractList
<
E
>
-
-
Parameters:
-
index - index at which to insert
the
first element from the specified
collection
collection.
-
c - elements to be inserted into this
Vector
Vector.
-
Returns:
-
true
if this Vector changed as a result of the
call
call.
-
Throws:
-
ArrayIndexOutOfBoundsException
- index out of range (index < 0 || index >
size())
size()).
-
NullPointerException
- if the specified collection is
null
null.
-
Since:
-
1.2
equals
public boolean equals(Object o)
-
Compares the specified Object with this Vector for equality. Returns true if and only if the specified Object is also a List, both Lists have the same size, and all corresponding pairs of elements in the two Lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two Lists are defined to be equal if they contain the same elements in the same order.
-
-
Specified by:
-
equals
in interface
Collection
<
E
>
-
Specified by:
-
equals
in interface
List
<
E
>
-
Overrides:
-
equals
in class
AbstractList
<
E
>
-
-
Parameters:
-
o - the Object to be compared for equality with this
Vector
Vector.
-
Returns:
-
true if the specified Object is equal to this Vector
-
See Also:
-
Object.hashCode()
,
Hashtable
hashCode
public int hashCode()
-
Returns the hash code value for this Vector.
-
-
Specified by:
-
hashCode
in interface
Collection
<
E
>
-
Specified by:
-
hashCode
in interface
List
<
E
>
-
Overrides:
-
hashCode
in class
AbstractList
<
E
>
-
-
Returns:
-
the hash code value for this
list
list.
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable
toString
public String toString()
-
Returns a string representation of this Vector, containing the String representation of each element.
-
-
Overrides:
-
toString
in class
AbstractCollection
<
E
>
-
-
Returns:
-
a string representation of this
collection
collection.
subList
public List<E> subList(int fromIndex,
int toIndex)
-
Returns a view of the portion of this List between fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and
toIndex
ToIndex
are equal, the returned List is empty.) The returned List is backed by this List, so changes in the returned List are reflected in this List, and vice-versa. The returned List supports all of the optional List operations supported by this List.
This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a List can be used as a range operation by operating on a subList view instead of a whole List. For example, the following idiom removes a range of elements from a List:
list.subList(from, to).clear();
Similar idioms may be constructed for indexOf and lastIndexOf, and all of the algorithms in the Collections class can be applied to a subList.
The semantics of the List returned by this method become undefined if the backing list (i.e., this List) is
structurally modified
in any way other than via the returned List. (Structural modifications are those that change the size of the List, or otherwise perturb it in such a fashion that iterations in progress may yield incorrect results.)
-
-
Specified by:
-
subList
in interface
List
<
E
>
-
Overrides:
-
subList
in class
AbstractList
<
E
>
-
-
Parameters:
-
fromIndex - low endpoint (inclusive) of the
subList
subList.
-
toIndex - high endpoint (exclusive) of the
subList
subList.
-
Returns:
-
a view of the specified range within this
List
List.
-
Throws:
-
IndexOutOfBoundsException
- endpoint index value out of range (fromIndex < 0 || toIndex > size)
-
IllegalArgumentException
- endpoint indices out of order (fromIndex > toIndex)
removeRange
protected void removeRange(int fromIndex,
int toIndex)
-
Removes from this List all of the elements whose index is between fromIndex, inclusive and toIndex, exclusive. Shifts any succeeding elements to the left (reduces their index). This call shortens the ArrayList by (toIndex - fromIndex) elements. (If toIndex==fromIndex, this operation has no effect.)
-
-
Overrides:
-
removeRange
in class
AbstractList
<
E
>
-
-
Parameters:
-
fromIndex - index of first element to be
removed
removed.
-
toIndex - index after last element to be
removed
removed.