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

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

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 , toString , wait , wait , wait

AtomicReference

public AtomicReference(V initialValue)

Create a new AtomicReference with the given initial value.

Parameters:

initialValue - the initial value

AtomicReference

public AtomicReference()

Create a new AtomicReference with null initial value.

get

public final V get()

Get the current value.

Returns:

the current value

set

public final void set(V newValue)

Set to the given value.

Parameters:

newValue - the new value

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.

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.

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

toString

 
public StringtoString () 

Returns the String representation of the current value.

Overrides:

toString in class Object

Returns:

the String representation of the current value.