ReferenceQueue

extends Object

java.lang.Object
↳	java.lang.ref.ReferenceQueue<T>

Class Overview

The ReferenceQueue is the container on which reference objects are enqueued when the garbage collector detects the reachability type specified for the referent.

Summary

Public Constructors
	ReferenceQueue() Constructs a new instance of this class.

Public Methods
synchronized Reference<? extends T>	poll() Returns the next available reference from the queue, removing it in the process.
Reference<? extends T>	remove() Returns the next available reference from the queue, removing it in the process.
synchronized Reference<? extends T>	remove(long timeout) Returns the next available reference from the queue, removing it in the process.

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Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Called before the object's memory is reclaimed by the VM.
final Class<? extends Object>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Constructors

public ReferenceQueue ()

Since: API Level 1

Constructs a new instance of this class.

Public Methods

public synchronized Reference<? extends T> poll ()

Since: API Level 1

Returns the next available reference from the queue, removing it in the process. Does not wait for a reference to become available.

Returns

the next available reference, or null if no reference is immediately available

public Reference<? extends T> remove ()

Since: API Level 1

Returns the next available reference from the queue, removing it in the process. Waits indefinitely for a reference to become available.

Returns

the next available reference

Throws

InterruptedException	if the blocking call was interrupted for some reason

public synchronized Reference<? extends T> remove (long timeout)

Since: API Level 1

Returns the next available reference from the queue, removing it in the process. Waits for a reference to become available or the given timeout period to elapse, whichever happens first.

Parameters

timeout	maximum time (in ms) to spend waiting for a reference object to become available. A value of zero results in the method waiting indefinitely.

Returns

the next available reference, or null if no reference becomes available within the timeout period

Throws

IllegalArgumentException	if the wait period is negative.
InterruptedException	if the blocking call was interrupted for some reason

Classes

ReferenceQueue

Class Overview

Summary

Public Constructors

public ReferenceQueue ()

Public Methods

public synchronized Reference<? extends T> poll ()

Returns

public Reference<? extends T> remove ()

Returns

Throws

public synchronized Reference<? extends T> remove (long timeout)

Parameters

Returns

Throws