| Package | Description | 
|---|---|
| java.lang.ref | 
 Provides reference-object classes, which support a limited degree of
interaction with the garbage collector. 
 | 
| Constructor and Description | 
|---|
PhantomReference(T referent,
                ReferenceQueue<? super T> q)
Creates a new phantom reference that refers to the given object and
 is registered with the given queue. 
 | 
SoftReference(T referent,
             ReferenceQueue<? super T> q)
Creates a new soft reference that refers to the given object and is
 registered with the given queue. 
 | 
WeakReference(T referent,
             ReferenceQueue<? super T> q)
Creates a new weak reference that refers to the given object and is
 registered with the given queue. 
 | 
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