| Package | Description | 
|---|---|
| java.time.zone | 
 Support for time-zones and their rules. | 
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| java.util.concurrent | Utility classes commonly useful in concurrent programming. | 
| Modifier and Type | Method and Description | 
|---|---|
| static NavigableMap<String,ZoneRules> | ZoneRulesProvider. getVersions(String zoneId)Gets the history of rules for the zone ID. | 
| protected abstract NavigableMap<String,ZoneRules> | ZoneRulesProvider. provideVersions(String zoneId)SPI method to get the history of rules for the zone ID. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | TreeMap<K,V>A Red-Black tree based  NavigableMapimplementation. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <K,V> NavigableMap<K,V> | Collections. checkedNavigableMap(NavigableMap<K,V> m,
                   Class<K> keyType,
                   Class<V> valueType)Returns a dynamically typesafe view of the specified navigable map. | 
| NavigableMap<K,V> | NavigableMap. descendingMap()Returns a reverse order view of the mappings contained in this map. | 
| NavigableMap<K,V> | TreeMap. descendingMap() | 
| static <K,V> NavigableMap<K,V> | Collections. emptyNavigableMap()Returns an empty navigable map (immutable). | 
| NavigableMap<K,V> | NavigableMap. headMap(K toKey,
       boolean inclusive)Returns a view of the portion of this map whose keys are less than (or
 equal to, if  inclusiveis true)toKey. | 
| NavigableMap<K,V> | TreeMap. headMap(K toKey,
       boolean inclusive) | 
| NavigableMap<K,V> | NavigableMap. subMap(K fromKey,
      boolean fromInclusive,
      K toKey,
      boolean toInclusive)Returns a view of the portion of this map whose keys range from
  fromKeytotoKey. | 
| NavigableMap<K,V> | TreeMap. subMap(K fromKey,
      boolean fromInclusive,
      K toKey,
      boolean toInclusive) | 
| static <K,V> NavigableMap<K,V> | Collections. synchronizedNavigableMap(NavigableMap<K,V> m)Returns a synchronized (thread-safe) navigable map backed by the
 specified navigable map. | 
| NavigableMap<K,V> | NavigableMap. tailMap(K fromKey,
       boolean inclusive)Returns a view of the portion of this map whose keys are greater than (or
 equal to, if  inclusiveis true)fromKey. | 
| NavigableMap<K,V> | TreeMap. tailMap(K fromKey,
       boolean inclusive) | 
| static <K,V> NavigableMap<K,V> | Collections. unmodifiableNavigableMap(NavigableMap<K,? extends V> m)Returns an unmodifiable view of the specified navigable map. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <K,V> NavigableMap<K,V> | Collections. checkedNavigableMap(NavigableMap<K,V> m,
                   Class<K> keyType,
                   Class<V> valueType)Returns a dynamically typesafe view of the specified navigable map. | 
| static <K,V> NavigableMap<K,V> | Collections. synchronizedNavigableMap(NavigableMap<K,V> m)Returns a synchronized (thread-safe) navigable map backed by the
 specified navigable map. | 
| static <K,V> NavigableMap<K,V> | Collections. unmodifiableNavigableMap(NavigableMap<K,? extends V> m)Returns an unmodifiable view of the specified navigable map. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | ConcurrentNavigableMap<K,V>A  ConcurrentMapsupportingNavigableMapoperations,
 and recursively so for its navigable sub-maps. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ConcurrentSkipListMap<K,V>A scalable concurrent  ConcurrentNavigableMapimplementation. | 
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