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