Java™ Platform
Standard Ed. 6

Uses of Class

Packages that use Reference
java.lang.ref Provides reference-object classes, which support a limited degree of interaction with the garbage collector. 

Uses of Reference in java.lang.ref

Subclasses of Reference in java.lang.ref
 class PhantomReference<T>
          Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
 class SoftReference<T>
          Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
 class WeakReference<T>
          Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.

Methods in java.lang.ref that return Reference
 Reference<? extends T> ReferenceQueue.poll()
          Polls this queue to see if a reference object is available.
 Reference<? extends T> ReferenceQueue.remove()
          Removes the next reference object in this queue, blocking until one becomes available.
 Reference<? extends T> ReferenceQueue.remove(long timeout)
          Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.

Java™ Platform
Standard Ed. 6

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