程序包 java.util.concurrent.atomic

类 AtomicBoolean

java.lang.Object

java.util.concurrent.atomic.AtomicBoolean

所有已实现的接口:

Serializable

public class AtomicBoolean
extends Object
implements Serializable

A boolean value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicBoolean is used in applications such as atomically updated flags, and cannot be used as a replacement for a Boolean.

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
AtomicBoolean()	Creates a new AtomicBoolean with initial value false.
AtomicBoolean(boolean initialValue)	Creates a new AtomicBoolean with the given initial value.

方法概要

限定符和类型	方法	说明
boolean	compareAndSet(boolean expect, boolean update)	Atomically sets the value to the given updated value if the current value == the expected value.
boolean	get()	Returns the current value.
boolean	getAndSet(boolean newValue)	Atomically sets to the given value and returns the previous value.
void	lazySet(boolean newValue)	Eventually sets to the given value.
void	set(boolean newValue)	Unconditionally sets to the given value.
String	toString()	Returns the String representation of the current value.
boolean	weakCompareAndSet(boolean expect, boolean 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

AtomicBoolean

public AtomicBoolean(boolean initialValue)

Creates a new AtomicBoolean with the given initial value.

参数:

initialValue - the initial value

AtomicBoolean

public AtomicBoolean()

Creates a new AtomicBoolean with initial value false.

方法详细资料

get

public final boolean get()

Returns the current value.

返回:

the current value

compareAndSet

public final boolean compareAndSet(boolean expect,
                                   boolean 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 boolean weakCompareAndSet(boolean expect,
                                 boolean 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

set

public final void set(boolean newValue)

Unconditionally sets to the given value.

参数:

newValue - the new value

lazySet

public final void lazySet(boolean newValue)

Eventually sets to the given value.

参数:

newValue - the new value

从以下版本开始:

1.6

getAndSet

public final boolean getAndSet(boolean newValue)

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

参数:

newValue - the new value

返回:

the previous value

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