AtomicIntegerArray documentation

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java.util.concurrent.atomic

Class AtomicIntegerArray

public class AtomicIntegerArray
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.

Since1.5

VersionNot specified.

AuthorDoug Lea

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

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

Methods inherited from java.langObject
clone () equals (Object) finalize () getClass () hashCode () notify () notifyAll () wait () wait (long, int) wait (long)

Constructor Detail

AtomicIntegerArray

public AtomicIntegerArray ( int length )

Creates a new AtomicIntegerArray of given length.

Parameters

Type	Name	Description
int	length	the length of the array

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AtomicIntegerArray

public AtomicIntegerArray ( int [] array )

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

Parameters

Type	Name	Description
int[]	array	the array to copy elements from

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Method Detail

addAndGet

public final int addAndGet ( int i, int delta )

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

Parameters

Type	Name	Description
int	i	the index
int	delta	the value to add

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compareAndSet

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

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

Parameters

Type	Name	Description
int	i	the index
int	expect	the expected value
int	update	the new value

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decrementAndGet

public final int decrementAndGet ( int i )

Atomically decrements by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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get

public final int get ( int i )

Gets the current value at position i .

Parameters

Type	Name	Description
int	i	the index

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getAndAdd

public final int getAndAdd ( int i, int delta )

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

Parameters

Type	Name	Description
int	i	the index
int	delta	the value to add

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getAndDecrement

public final int getAndDecrement ( int i )

Atomically decrements by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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getAndIncrement

public final int getAndIncrement ( int i )

Atomically increments by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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getAndSet

public final int getAndSet ( int i, int newValue )

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

Parameters

Type	Name	Description
int	i	the index
int	newValue	the new value

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incrementAndGet

public final int incrementAndGet ( int i )

Atomically increments by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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lazySet

public final void lazySet ( int i, int newValue )

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

Since: 1.6

Parameters

Type	Name	Description
int	i	the index
int	newValue	the new value

Returns void No description provided.

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length

public final int length ( )

Returns the length of the array.

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set

public final void set ( int i, int newValue )

Sets the element at position i to the given value.

Parameters

Type	Name	Description
int	i	the index
int	newValue	the new value

Returns void No description provided.

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toString

public String toString ( )

Returns the String representation of the current values of array.

Overrides method in Object

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weakCompareAndSet

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

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

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet .

Parameters

Type	Name	Description
int	i	the index
int	expect	the expected value
int	update	the new value

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