程序包 java.lang.ref

类 ReferenceQueue<T>

java.lang.Object

java.lang.ref.ReferenceQueue<T>

public class ReferenceQueue<T>
extends Object

Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.

从以下版本开始:

1.2

构造器概要

构造器

构造器	说明
ReferenceQueue()	Constructs a new reference-object queue.

方法概要

限定符和类型	方法	说明
Reference<? extends T>	poll()	Polls this queue to see if a reference object is available.
Reference<? extends T>	remove()	Removes the next reference object in this queue, blocking until one becomes available.
Reference<? extends T>	remove(long timeout)	Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.

从类继承的方法 java.lang.Object

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

构造器详细资料

ReferenceQueue

public ReferenceQueue()

Constructs a new reference-object queue.

方法详细资料

poll

public Reference<? extends T> poll()

Polls this queue to see if a reference object is available. If one is available without further delay then it is removed from the queue and returned. Otherwise this method immediately returns null.

返回:

A reference object, if one was immediately available, otherwise null

remove

public Reference<? extends T> remove(long timeout)
                              throws IllegalArgumentException,
                                     InterruptedException

Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.

This method does not offer real-time guarantees: It schedules the timeout as if by invoking the Object#wait(long) method.

参数:

timeout - If positive, block for up to timeout milliseconds while waiting for a reference to be added to this queue. If zero, block indefinitely.

返回:

A reference object, if one was available within the specified timeout period, otherwise null

抛出:

IllegalArgumentException - If the value of the timeout argument is negative

InterruptedException - If the timeout wait is interrupted

remove

public Reference<? extends T> remove()
                              throws InterruptedException

Removes the next reference object in this queue, blocking until one becomes available.

返回:

A reference object, blocking until one becomes available

抛出:

InterruptedException - If the wait is interrupted