| Interface | Description | 
|---|---|
| Function<F,T> | 
 A Function provides a transformation on an object and returns the resulting
 object. 
 | 
| ReferenceMap.Strategy | 
| Class | Description | 
|---|---|
| FinalizablePhantomReference<T> | 
 Phantom reference with a  
finalizeReferent() method which a
 background thread invokes after the garbage collector reclaims the
 referent. | 
| FinalizableSoftReference<T> | 
 Soft reference with a  
finalizeReferent() method which a background
 thread invokes after the garbage collector reclaims the referent. | 
| FinalizableWeakReference<T> | 
 Weak reference with a  
finalizeReferent() method which a background
 thread invokes after the garbage collector reclaims the referent. | 
| ReferenceCache<K,V> | 
 Extends  
ReferenceMap to support lazy loading values by overriding
 ReferenceCache.create(Object). | 
| ReferenceMap<K,V> | 
 Concurrent hash map that wraps keys and/or values in soft or weak
 references. 
 | 
| Strings | Deprecated | 
| Enum | Description | 
|---|---|
| ReferenceType | 
 Reference type. 
 | 
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