| Package | Description | 
|---|---|
| java.lang.ref | Provides reference-object classes, which support a limited degree of
interaction with the garbage collector. | 
| Class and Description | 
|---|
| Reference Abstract base class for reference objects. | 
| ReferenceQueue Reference queues, to which registered reference objects are appended by the
 garbage collector after the appropriate reachability changes are detected. | 
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