| Interface | Description | 
|---|---|
| ConcurrentMap | A highly concurrent map. | 
| Class | Description | 
|---|---|
| AbstractConcurrentEventManager | Base event manager that handles adding/removing listeners
 and firing events. | 
| ConcurrentHashMap | This class implements a HashMap which has limited synchronization. | 
| ConcurrentHashMap.Entry | |
| ConcurrentReferenceHashMap | This class implements a HashMap which has limited synchronization
 and reference keys or values(but not both). | 
| ConcurrentReferenceHashSet<E> | A concurrent set whose values may be stored as weak or soft references. | 
Concurrent Utilities
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