| Package | Description | 
|---|---|
| java.util.concurrent | 
 Utility classes commonly useful in concurrent programming. 
 | 
| Modifier and Type | Method and Description | 
|---|---|
ConcurrentHashMap.KeySetView<K,V> | 
ConcurrentHashMap.keySet()
Returns a  
Set view of the keys contained in this map. | 
ConcurrentHashMap.KeySetView<K,V> | 
ConcurrentHashMap.keySet(V mappedValue)
Returns a  
Set view of the keys in this map, using the
 given common mapped value for any additions (i.e., Collection.add(E) and Collection.addAll(Collection)). | 
static <K> ConcurrentHashMap.KeySetView<K,Boolean> | 
ConcurrentHashMap.newKeySet()
Creates a new  
Set backed by a ConcurrentHashMap
 from the given type to Boolean.TRUE. | 
static <K> ConcurrentHashMap.KeySetView<K,Boolean> | 
ConcurrentHashMap.newKeySet(int initialCapacity)
Creates a new  
Set backed by a ConcurrentHashMap
 from the given type to Boolean.TRUE. | 
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