/*
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}
*/
