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AtomicReferenceArray (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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java.util.concurrent.atomic
Class AtomicReferenceArray<E>

java.lang.Object
  java.util.concurrent.atomic.AtomicReferenceArray<E>

Type Parameters:

E - The base class of elements held in this array

All Implemented Interfaces:

Serializable

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public class AtomicReferenceArray<E>
extends Object
implements Serializable

An array of object references 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

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

 

Method Summary
boolean	compareAndSet(int i, E expect, E update)           Atomically set the value to the given updated value if the current value == the expected value.
E	get(int i)           Get the current value at position i.
E	getAndSet(int i, E newValue)           Set the element at position i to the given value and return the old value.
int	length()           Returns the length of the array.
void	set(int i, E newValue)           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, E expect, E update)           Atomically set the 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

AtomicReferenceArray

public AtomicReferenceArray(int length)

Create a new AtomicReferenceArray of given length.

Parameters:

length - the length of the array

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AtomicReferenceArray

public AtomicReferenceArray(E[] array)

Create a new AtomicReferenceArray 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

Method Detail

length

public final int length()

Returns the length of the array.

Returns:

the length of the array

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get

public final E get(int i)

Get the current value at position i.

Parameters:

i - the index

Returns:

the current value

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set

public final void set(int i,
                      E newValue)

Set the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

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getAndSet

public final E getAndSet(int i,
                         E newValue)

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

Parameters:

i - the index

newValue - the new value

Returns:

the previous value

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compareAndSet

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

Atomically set the value 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.

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weakCompareAndSet

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

Atomically set the value 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.

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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.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.