Get Sub Map from TreeMap in Java

To get Sub Map in Java, use the submap() method. It returns the elements in a range from the Map.

First, create a TreeMap and add elements −

TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS");

Now, get the Sub Map between 4 and 6 −

m.subMap(4, 6)

The following is an example to get Sub Map from Tree Map in Java

Example

 Live Demo

import java.util.*; public class Demo { public static void main(String args[]){ TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS"); System.out.println("TreeMap Elements...\n"+m); System.out.println("Sub Map = " + m.subMap(4, 6)); } }

Output

TreeMap Elements... {1=PHP, 2=jQuery, 3=JavaScript, 4=Ruby, 5=Java, 6=AngularJS, 7=ExpressJS} Sub Map = {4=Ruby, 5=Java}