Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class WeakReference - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档
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JavaTM 2 Platform Standard Edition |
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java.lang.ref
Class WeakReference
java.lang.Object | +--java.lang.ref.Reference | +--java.lang.ref.WeakReference
- public class WeakReference
- extends Reference
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.
- Since:
- JDK1.2
| Constructor Summary | |
WeakReference(Object referent)
Creates a new weak reference that refers to the given object. |
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WeakReference(Object referent,
ReferenceQueue q)
Creates a new weak reference that refers to the given object and is registered with the given queue. |
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| Methods inherited from class java.lang.ref.Reference |
clear,
enqueue,
get,
isEnqueued |
| Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
| Constructor Detail |
WeakReference
public WeakReference(Object referent)
- Creates a new weak reference that refers to the given object. The new reference is not registered with any queue.
WeakReference
public WeakReference(Object referent, ReferenceQueue q)
- Creates a new weak reference that refers to the given object and is
registered with the given queue.
- Throws:
- NullPointerException - If the
queueargument isnull
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