Uses of Class java.lang.ref.Reference (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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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<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.

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.

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.