Interface ConcurrentNavigableMap<K,V> 
- Type Parameters:
- K- the type of keys maintained by this map
- V- the type of mapped values
- All Superinterfaces:
- ConcurrentMap<K,,- V> - Map<K,,- V> - NavigableMap<K,,- V> - SequencedMap<K,,- V> - SortedMap<K,- V> 
- All Known Implementing Classes:
- ConcurrentSkipListMap
ConcurrentMap supporting NavigableMap operations,
 and recursively so for its navigable sub-maps.
 This interface is a member of the Java Collections Framework.
- Since:
- 1.6
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Nested Class Summary
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Method SummaryModifier and TypeMethodDescriptionReturns a reverse orderNavigableSetview of the keys contained in this map.Returns a reverse order view of the mappings contained in this map.Returns a view of the portion of this map whose keys are strictly less thantoKey.Returns a view of the portion of this map whose keys are less than (or equal to, ifinclusiveis true)toKey.keySet()Returns aNavigableSetview of the keys contained in this map.Returns aNavigableSetview of the keys contained in this map.Returns a view of the portion of this map whose keys range fromfromKeytotoKey.Returns a view of the portion of this map whose keys range fromfromKey, inclusive, totoKey, exclusive.Returns a view of the portion of this map whose keys are greater than or equal tofromKey.Returns a view of the portion of this map whose keys are greater than (or equal to, ifinclusiveis true)fromKey.Methods declared in interface java.util.concurrent.ConcurrentMapcompute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAllMethods declared in interface java.util.Mapclear, containsKey, containsValue, equals, get, hashCode, isEmpty, put, putAll, remove, sizeMethods declared in interface java.util.NavigableMapceilingEntry, ceilingKey, firstEntry, floorEntry, floorKey, higherEntry, higherKey, lastEntry, lowerEntry, lowerKey, pollFirstEntry, pollLastEntry, reversedMethods declared in interface java.util.SequencedMapsequencedEntrySet, sequencedKeySet, sequencedValues
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Method Details- 
subMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys range fromfromKeytotoKey. IffromKeyandtoKeyare equal, the returned map is empty unlessfromInclusiveandtoInclusiveare both true. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside of its range, or to construct a submap either of whose endpoints lie outside its range.- Specified by:
- subMapin interface- NavigableMap<K,- V> 
- Parameters:
- fromKey- low endpoint of the keys in the returned map
- fromInclusive-- trueif the low endpoint is to be included in the returned view
- toKey- high endpoint of the keys in the returned map
- toInclusive-- trueif the high endpoint is to be included in the returned view
- Returns:
- a view of the portion of this map whose keys range from
         fromKeytotoKey
- Throws:
- ClassCastException- if- fromKeyand- toKeycannot be compared to one another using this map's comparator (or, if the map has no comparator, using natural ordering). Implementations may, but are not required to, throw this exception if- fromKeyor- toKeycannot be compared to keys currently in the map.
- NullPointerException- if- fromKeyor- toKeyis null and this map does not permit null keys
- IllegalArgumentException- if- fromKeyis greater than- toKey; or if this map itself has a restricted range, and- fromKeyor- toKeylies outside the bounds of the range
 
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headMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys are less than (or equal to, ifinclusiveis true)toKey. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside its range.- Specified by:
- headMapin interface- NavigableMap<K,- V> 
- Parameters:
- toKey- high endpoint of the keys in the returned map
- inclusive-- trueif the high endpoint is to be included in the returned view
- Returns:
- a view of the portion of this map whose keys are less than
         (or equal to, if inclusiveis true)toKey
- Throws:
- ClassCastException- if- toKeyis not compatible with this map's comparator (or, if the map has no comparator, if- toKeydoes not implement- Comparable). Implementations may, but are not required to, throw this exception if- toKeycannot be compared to keys currently in the map.
- NullPointerException- if- toKeyis null and this map does not permit null keys
- IllegalArgumentException- if this map itself has a restricted range, and- toKeylies outside the bounds of the range
 
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tailMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys are greater than (or equal to, ifinclusiveis true)fromKey. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside its range.- Specified by:
- tailMapin interface- NavigableMap<K,- V> 
- Parameters:
- fromKey- low endpoint of the keys in the returned map
- inclusive-- trueif the low endpoint is to be included in the returned view
- Returns:
- a view of the portion of this map whose keys are greater than
         (or equal to, if inclusiveis true)fromKey
- Throws:
- ClassCastException- if- fromKeyis not compatible with this map's comparator (or, if the map has no comparator, if- fromKeydoes not implement- Comparable). Implementations may, but are not required to, throw this exception if- fromKeycannot be compared to keys currently in the map.
- NullPointerException- if- fromKeyis null and this map does not permit null keys
- IllegalArgumentException- if this map itself has a restricted range, and- fromKeylies outside the bounds of the range
 
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subMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys range fromfromKey, inclusive, totoKey, exclusive. (IffromKeyandtoKeyare equal, the returned map is empty.) The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside its range.Equivalent to subMap(fromKey, true, toKey, false).- Specified by:
- subMapin interface- NavigableMap<K,- V> 
- Specified by:
- subMapin interface- SortedMap<K,- V> 
- Parameters:
- fromKey- low endpoint (inclusive) of the keys in the returned map
- toKey- high endpoint (exclusive) of the keys in the returned map
- Returns:
- a view of the portion of this map whose keys range from
         fromKey, inclusive, totoKey, exclusive
- Throws:
- ClassCastException- if- fromKeyand- toKeycannot be compared to one another using this map's comparator (or, if the map has no comparator, using natural ordering). Implementations may, but are not required to, throw this exception if- fromKeyor- toKeycannot be compared to keys currently in the map.
- NullPointerException- if- fromKeyor- toKeyis null and this map does not permit null keys
- IllegalArgumentException- if- fromKeyis greater than- toKey; or if this map itself has a restricted range, and- fromKeyor- toKeylies outside the bounds of the range
 
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headMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys are strictly less thantoKey. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside its range.Equivalent to headMap(toKey, false).- Specified by:
- headMapin interface- NavigableMap<K,- V> 
- Specified by:
- headMapin interface- SortedMap<K,- V> 
- Parameters:
- toKey- high endpoint (exclusive) of the keys in the returned map
- Returns:
- a view of the portion of this map whose keys are strictly
         less than toKey
- Throws:
- ClassCastException- if- toKeyis not compatible with this map's comparator (or, if the map has no comparator, if- toKeydoes not implement- Comparable). Implementations may, but are not required to, throw this exception if- toKeycannot be compared to keys currently in the map.
- NullPointerException- if- toKeyis null and this map does not permit null keys
- IllegalArgumentException- if this map itself has a restricted range, and- toKeylies outside the bounds of the range
 
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tailMapDescription copied from interface:NavigableMapReturns a view of the portion of this map whose keys are greater than or equal tofromKey. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.The returned map will throw an IllegalArgumentExceptionon an attempt to insert a key outside its range.Equivalent to tailMap(fromKey, true).- Specified by:
- tailMapin interface- NavigableMap<K,- V> 
- Specified by:
- tailMapin interface- SortedMap<K,- V> 
- Parameters:
- fromKey- low endpoint (inclusive) of the keys in the returned map
- Returns:
- a view of the portion of this map whose keys are greater
         than or equal to fromKey
- Throws:
- ClassCastException- if- fromKeyis not compatible with this map's comparator (or, if the map has no comparator, if- fromKeydoes not implement- Comparable). Implementations may, but are not required to, throw this exception if- fromKeycannot be compared to keys currently in the map.
- NullPointerException- if- fromKeyis null and this map does not permit null keys
- IllegalArgumentException- if this map itself has a restricted range, and- fromKeylies outside the bounds of the range
 
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descendingMapConcurrentNavigableMap<K,V> descendingMap()Returns a reverse order view of the mappings contained in this map. The descending map is backed by this map, so changes to the map are reflected in the descending map, and vice-versa.The returned map has an ordering equivalent to Collections.reverseOrder(comparator()). The expressionm.descendingMap().descendingMap()returns a view ofmessentially equivalent tom.- Specified by:
- descendingMapin interface- NavigableMap<K,- V> 
- Returns:
- a reverse order view of this map
 
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keySetNavigableSet<K> keySet()Returns aNavigableSetview of the keys contained in this map. The set's iterator returns the keys in ascending order. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. The set supports element removal, which removes the corresponding mapping from the map, via theIterator.remove,Set.remove,removeAll,retainAll, andclearoperations. It does not support theaddoraddAlloperations.The view's iterators and spliterators are weakly consistent. This method is equivalent to method navigableKeySet.
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descendingKeySetNavigableSet<K> descendingKeySet()Returns a reverse orderNavigableSetview of the keys contained in this map. The set's iterator returns the keys in descending order. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. The set supports element removal, which removes the corresponding mapping from the map, via theIterator.remove,Set.remove,removeAll,retainAll, andclearoperations. It does not support theaddoraddAlloperations.The view's iterators and spliterators are weakly consistent. - Specified by:
- descendingKeySetin interface- NavigableMap<K,- V> 
- Returns:
- a reverse order navigable set view of the keys in this map
 
 
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