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