java.util.concurrent.atomic
Class AtomicIntegerArray

java.lang.Object
  java.util.concurrent.atomic.AtomicIntegerArray

All Implemented Interfaces:

Serializable

public class AtomicIntegerArray
extends Object
implements Serializable

An int array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

Since:

1.5

See Also:

Serialized Form

Constructor Summary
AtomicIntegerArray (int length)           Creates           Create a new AtomicIntegerArray of given length.
AtomicIntegerArray (int[] array)           Creates           Create a new AtomicIntegerArray with the same length as, and all elements copied from, the given array.

 

Method Summary
int	addAndGet (int i, int delta)           Atomically adds add the given value to the element at index i .
boolean	compareAndSet (int i, int expect, int update)           Atomically sets set the element at position i value to the given updated value if the current value == the expected value.
int	decrementAndGet (int i)           Atomically decrements decrement by one the element at index i .
int	get (int i)           Gets           Get the current value at position i .
int	getAndAdd (int i, int delta)           Atomically adds add the given value to the element at index i .
int	getAndDecrement (int i)           Atomically decrements decrement by one the element at index i .
int	getAndIncrement (int i)           Atomically increments increment by one the element at index i .
int	getAndSet (int i, int newValue)           Atomically sets           Set the element at position i to the given value and returns return the old value.
int	incrementAndGet (int i)           Atomically increments increment by one the element at index i .
void	lazySet (int i, int newValue)           Eventually sets the element at position i to the given value.
int	length ()           Returns the length of the array.
void	set (int i, int newValue)           Sets           Set the element at position i to the given value.
String	toString ()           Returns the String representation of the current values of array.
boolean	weakCompareAndSet (int i, int expect, int update)           Atomically sets set the element at position i value to the given updated value if the current value == the expected value.

 

Methods inherited from class java.lang. Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait

 

Constructor Detail

AtomicIntegerArray

public AtomicIntegerArray(int length)

Creates Create a new AtomicIntegerArray of given length.

Parameters:

length - the length of the array

AtomicIntegerArray

public AtomicIntegerArray(int[] array)

Creates Create a new AtomicIntegerArray with the same length as, and all elements copied from, the given array.

Parameters:

array - the array to copy elements from

Throws:

NullPointerException - if array is null

length

public final int length()

Returns the length of the array.

Returns:

the length of the array

get

public final int get(int i)

Gets Get the current value at position i .

Parameters:

i - the index

Returns:

the current value

set

public final void set(int i,
                      int newValue)

Sets Set the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

lazySet

 
public final void lazySet (int i,
 int newValue) 

Eventually sets the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

Since:

1.6

getAndSet

public final int getAndSet(int i,
                           int newValue)

Atomically sets Set the element at position i to the given value and returns return the old value.

Parameters:

i - the index

newValue - the new value

Returns:

the previous value

compareAndSet

public final boolean compareAndSet(int i,
                                   int expect,
                                   int update)

Atomically sets the element at position Atomically set the value to the given updated value if the current value i to the given updated value if the current value == the expected value.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.

weakCompareAndSet

public final boolean weakCompareAndSet(int i,
                                       int expect,
                                       int update)

Atomically sets the element at position Atomically set the value to the given updated value if the current value i to the given updated value if the current value == the expected value. May fail spuriously.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful.

getAndIncrement

public final int getAndIncrement(int i)

Atomically increments increment by one the element at index i .

Parameters:

i - the index

Returns:

the previous value value;

getAndDecrement

public final int getAndDecrement(int i)

Atomically decrements decrement by one the element at index i .

Parameters:

i - the index

Returns:

the previous value value;

getAndAdd

public final int getAndAdd(int i,
                           int delta)

Atomically adds add the given value to the element at index i .

Parameters:

i - the index

delta - the value to add

Returns:

the previous value value;

incrementAndGet

public final int incrementAndGet(int i)

Atomically increments increment by one the element at index i .

Parameters:

i - the index

Returns:

the updated value value;

decrementAndGet

public final int decrementAndGet(int i)

Atomically decrements decrement by one the element at index i .

Parameters:

i - the index

Returns:

the updated value value;

addAndGet

public final int addAndGet(int i,
                           int delta)

Atomically adds add the given value to the element at index i .

Parameters:

i - the index

delta - the value to add

Returns:

the updated value value;

toString

public String toString()

Returns the String representation of the current values of array.

Overrides:

toString in class Object

Returns:

the String representation of the current values of array.