How to Get Sub Map from Java TreeMap

Here this example will use subMap method of Java TreeMap class to get the sub Map from Treemap by giving specific range of keys.

Source Code

package com.beginner.examples;

import java.util.SortedMap;
import java.util.TreeMap;

public class GetSubMapFromTreeMap {

	public static void main(String[] args) {
		
		//create TreeMap.
		TreeMap treeMap = new TreeMap();
		
		treeMap.put("1","Alice");
		treeMap.put("2","Bob");
		treeMap.put("3","Jack");
		
		/*
		 * To get the sub Map from Java TreeMap useing subMap method of TreeMap.
		 */
		SortedMap sortedMap = treeMap.subMap("2","4");
		
		System.out.println("SortedMap Contains : " + sortedMap);

	}

}

Output:

SortedMap Contains : {2=Bob, 3=Jack}

References

Imported packages in Java documentation:

TreeMap
SortedMap