程序包 java.util.concurrent.atomic

类 AtomicReference<V>

java.lang.Object

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

类型参数:

V - The type of object referred to by this reference

所有已实现的接口:

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.

从以下版本开始:

1.5

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
AtomicReference()	Creates a new AtomicReference with null initial value.
AtomicReference(V initialValue)	Creates a new AtomicReference with the given initial value.

方法概要

限定符和类型	方法	说明
V	accumulateAndGet(V x, BinaryOperator<V> accumulatorFunction)	Atomically updates the current value with the results of applying the given function to the current and given values, returning the updated value.
boolean	compareAndSet(V expect, V update)	Atomically sets the value to the given updated value if the current value == the expected value.
V	get()	Gets the current value.
V	getAndAccumulate(V x, BinaryOperator<V> accumulatorFunction)	Atomically updates the current value with the results of applying the given function to the current and given values, returning the previous value.
V	getAndSet(V newValue)	Atomically sets to the given value and returns the old value.
V	getAndUpdate(UnaryOperator<V> updateFunction)	Atomically updates the current value with the results of applying the given function, returning the previous value.
void	lazySet(V newValue)	Eventually sets to the given value.
void	set(V newValue)	Sets to the given value.
String	toString()	Returns the String representation of the current value.
V	updateAndGet(UnaryOperator<V> updateFunction)	Atomically updates the current value with the results of applying the given function, returning the updated value.
boolean	weakCompareAndSet(V expect, V update)	Atomically sets the value to the given updated value if the current value == the expected value.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

AtomicReference

public AtomicReference(V initialValue)

Creates a new AtomicReference with the given initial value.

参数:

initialValue - the initial value

AtomicReference

public AtomicReference()

Creates a new AtomicReference with null initial value.

方法详细资料

get

public final V get()

Gets the current value.

返回:

the current value

set

public final void set(V newValue)

Sets to the given value.

参数:

newValue - the new value

lazySet

public final void lazySet(V newValue)

Eventually sets to the given value.

参数:

newValue - the new value

从以下版本开始:

1.6

compareAndSet

public final boolean compareAndSet(V expect,
                                   V update)

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

参数:

expect - the expected value

update - the new value

返回:

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 sets the value 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.

参数:

expect - the expected value

update - the new value

返回:

true if successful

getAndSet

public final V getAndSet(V newValue)

Atomically sets to the given value and returns the old value.

参数:

newValue - the new value

返回:

the previous value

getAndUpdate

public final V getAndUpdate(UnaryOperator<V> updateFunction)

Atomically updates the current value with the results of applying the given function, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

参数:

updateFunction - a side-effect-free function

返回:

the previous value

从以下版本开始:

1.8

updateAndGet

public final V updateAndGet(UnaryOperator<V> updateFunction)

Atomically updates the current value with the results of applying the given function, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

参数:

updateFunction - a side-effect-free function

返回:

the updated value

从以下版本开始:

1.8

getAndAccumulate

public final V getAndAccumulate(V x,
                                BinaryOperator<V> accumulatorFunction)

Atomically updates the current value with the results of applying the given function to the current and given values, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

参数:

x - the update value

accumulatorFunction - a side-effect-free function of two arguments

返回:

the previous value

从以下版本开始:

1.8

accumulateAndGet

public final V accumulateAndGet(V x,
                                BinaryOperator<V> accumulatorFunction)

Atomically updates the current value with the results of applying the given function to the current and given values, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

参数:

x - the update value

accumulatorFunction - a side-effect-free function of two arguments

返回:

the updated value

从以下版本开始:

1.8

toString

public String toString()

Returns the String representation of the current value.

覆盖:

toString 在类中 Object

返回:

the String representation of the current value