Uses of Class java.lang.ref.Reference

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## Uses of Class
java.lang.ref.Reference

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` Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
`class` | `SoftReference` Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
`class` | `WeakReference` 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` | `ReferenceQueue.poll()` Polls this queue to see if a reference object is available.
`Reference` | `ReferenceQueue.remove()` Removes the next reference object in this queue, blocking until one becomes available.
`Reference` | `ReferenceQueue.remove(long timeout)` Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.

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