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| What is NavigableMap in Java 6 - Creating subMap from Map with Example Posted: 04 Jan 2013 07:38 AM PST NavigableMap in Java 6 is an extension of SortedMap like TreeMap which provides convenient navigation method like lowerKey, floorKey, ceilingKey and higherKey. NavigableMap is added on Java 1.6 and along with these popular navigation method it also provide ways to create a Sub Map from existing Map in Java e.g. headMap whose keys are less than specified key, tailMap whose keys are greater than specified key and a subMap which is strictly contains keys which falls between toKey and fromKey. All of these methods also provides a boolean to include specified key or not. TreeMap and ConcurrentSkipListMap are two concrete implementation of NavigableMap in Java 1.6 API. Though NavigableMap is not as popular as HashMap, ConcurrentHashMap or Hashtable but given that TreeMap implements NavigableMap you already get all good things in a well known Map implementation.         |
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This is very good article.Keep up good work - Java Vogue
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