PhantomReference<T> |
Implements a phantom reference, which is the weakest of the three types of
references. |
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. |
SoftReference<T> |
A reference that is cleared when its referent is not strongly reachable and
there is memory pressure. |
WeakReference<T> |
Implements a weak reference, which is the middle of the three types of
references. |