| 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  ReferenceMapto support lazy loading values by overridingReferenceCache.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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