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.
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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.
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