| PhantomReference<T> |
Implements a phantom reference, which is the weakest of the three types of
references.
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| Reference<T> |
Provides an abstract class which describes behavior common to all reference
objects.
|
| ReferenceQueue<T> |
The ReferenceQueue is the container on which reference objects are
enqueued when the garbage collector detects the reachability type specified
for the referent.
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| SoftReference<T> |
A reference that is cleared when its referent is not strongly reachable and
there is memory pressure.
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| WeakReference<T> |
Implements a weak reference, which is the middle of the three types of
references.
|