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JavaTM 2 Platform Standard Ed. 5.0 |
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java.lang.Object java.lang.ref.Reference<T> java.lang.ref.WeakReference<T>
public class WeakReference<T>
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.
Suppose that the garbage collector determines at a certain point in time that an object is weakly reachable. 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.
Constructor Summary | |
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WeakReference(T referent)
Creates a new weak reference that refers to the given object. |
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WeakReference(T referent,
ReferenceQueue<? super T> q)
Creates a new weak reference that refers to the given object and is registered with the given queue. |
Method Summary |
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Methods inherited from class java.lang.ref.Reference |
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clear, enqueue, get, isEnqueued |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public WeakReference(T referent)
referent
- object the new weak reference will refer topublic WeakReference(T referent, ReferenceQueue<? super T> q)
referent
- object the new weak reference will refer toq
- the queue with which the reference is to be registered,
or null if registration is not required
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JavaTM 2 Platform Standard Ed. 5.0 |
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Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.