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## Package java.lang.ref

Class Summary
PhantomReference | Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
Reference | Abstract base class for reference objects.
ReferenceQueue | Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
SoftReference | Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
WeakReference | Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.

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