| Class | Description | 
                            | ConcurrentReferenceHashMap | An advanced hash table supporting configurable garbage collection semantics
 of keys and values, optional referential-equality, full concurrency of
 retrievals, and adjustable expected concurrency for updates. | 
                            | ConcurrentReferenceHashMap.HashIterator |  | 
                            | ConcurrentReferenceHashMap.InitializableEntry |  | 
                            | ConcurrentReferenceHashMap.SimpleEntry |  | 
                            | ConcurrentReferenceHashMap.WriteThroughEntry | Custom Entry class used by EntryIterator.next(), that relays setValue
 changes to the underlying map. | 
                            | ManagedIdentityConcurrentMap | This is a basic implementation of a map able to forget its keys could be weak/soft/strong references. |