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WeakReference.java
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72 lines (65 loc) · 1.89 KB
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/*
* Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang.ref;
/**
* Weak reference objects, which do not prevent their referents from being
* made finalizable, finalized, and then reclaimed. Weak references are most
* often used to implement canonicalizing mappings.
*
* <p> Suppose that the garbage collector determines at a certain point in time
* that an object is <a href="package-summary.html#reachability">weakly
* reachable</a>. At that time it will atomically clear all weak references to
* that object and all weak references to any other weakly-reachable objects
* from which that object is reachable through a chain of strong and soft
* references. At the same time it will declare all of the formerly
* weakly-reachable objects to be finalizable. At the same time or at some
* later time it will enqueue those newly-cleared weak references that are
* registered with reference queues.
*
* @author Mark Reinhold
* @since 1.2
*/
public class WeakReference<T> extends Reference<T> {
/**
* Creates a new weak reference that refers to the given object. The new
* reference is not registered with any queue.
*
* @param referent object the new weak reference will refer to
*/
public WeakReference(T referent) {
super(referent);
}
/**
* Creates a new weak reference that refers to the given object and is
* registered with the given queue.
*
* @param referent object the new weak reference will refer to
* @param q the queue with which the reference is to be registered,
* or <tt>null</tt> if registration is not required
*/
public WeakReference(T referent, ReferenceQueue<? super T> q) {
super(referent, q);
}
}