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AtomicReference (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 AtomicReference<V>

java.lang.Object
  java.util.concurrent.atomic.AtomicReference<V>

Type Parameters:

V - The type of object referred to by this reference

All Implemented Interfaces:

Serializable

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public class AtomicReference<V>
extends Object
implements Serializable

An object reference that 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
AtomicReference()           Create a new AtomicReference with null initial value.
AtomicReference(V initialValue)           Create a new AtomicReference with the given initial value.

 

Method Summary
boolean	compareAndSet(V expect, V update)           Atomically set the value to the given updated value if the current value == the expected value.
V	get()           Get the current value.
V	getAndSet(V newValue)           Set to the given value and return the old value.
void	set(V newValue)           Set to the given value.
String	toString()           Returns the String representation of the current value.
boolean	weakCompareAndSet(V expect, V 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

AtomicReference

public AtomicReference(V initialValue)

Create a new AtomicReference with the given initial value.

Parameters:

initialValue - the initial value

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AtomicReference

public AtomicReference()

Create a new AtomicReference with null initial value.

Method Detail

get

public final V get()

Get the current value.

Returns:

the current value

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set

public final void set(V newValue)

Set to the given value.

Parameters:

newValue - the new value

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compareAndSet

public final boolean compareAndSet(V expect,
                                   V update)

Atomically set the value to the given updated value if the current value == the expected value.

Parameters:

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(V expect,
                                       V update)

Atomically set the value to the given updated value if the current value == the expected value. May fail spuriously.

Parameters:

expect - the expected value

update - the new value

Returns:

true if successful.

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getAndSet

public final V getAndSet(V newValue)

Set to the given value and return the old value.

Parameters:

newValue - the new value

Returns:

the previous value

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toString

public String toString()

Returns the String representation of the current value.

Overrides:

toString in class Object

Returns:

the String representation of the current value.

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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.