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Class Summary | |
| PhantomReference<T> | A phantom reference is useful, to get notified, when an object got finalized. |
| Reference<T> | This is the base class of all references. |
| ReferenceQueue<T> | This is the queue, where references can enqueue themselve on. |
| SoftReference<T> | A soft reference will be cleared, if the object is only softly reachable and the garbage collection needs more memory. |
| WeakReference<T> | A weak reference will be cleared, if the object is only weakly reachable. |