| 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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