Get Tail Map from Java TreeMap example
- /*
- Get Tail Map from Java TreeMap example
- This Java Example shows how to get the portion of TreeMap whose keys
- are grater than or equal to the specified key using tailMap method
- of Java TreeMap class.
- */
- import java.util.SortedMap;
- import java.util.TreeMap;
- public class GetTailMapFromTreeMapExample {
- public static void main(String[] args) {
- //create TreeMap object
- TreeMap treeMap = new TreeMap();
- //add key value pairs to TreeMap
- treeMap.put("1","One");
- treeMap.put("3","Three");
- treeMap.put("2","Two");
- treeMap.put("5","Five");
- treeMap.put("4","Four");
- /*
- To get a Tail Map from Java TreeMap use,
- SortedMap tailMap(Object fromKey) method of Java TreeMap class.
- This method returns the portion of TreeMap whose keys are grater than
- or equal to fromKey.
- Please note that, the SortedMap returned by this method is backed by
- the original TreeMap. So any changes made to SortedMap will be
- reflected back to original TreeMap.
- */
- SortedMap sortedMap = treeMap.tailMap("2");
- System.out.println("Tail Map Contains : " + sortedMap);
- /*
- Please also note that,
- - SortedMap throws IllegalArgumentException for any attempts to insert the
- key less than fromKey.
- - subMap throws ClassCastException, if fromKey can not be compared using
- Map's Comparators
- */
- }
- }
- /*
- Output would be
- Tail Map Contains : {2=Two, 3=Three, 4=Four, 5=Five}
- */
