| 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. |
