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