How to sort Map values by key in Java?

Let’s say the following is our Map with unsorted keys −

HashMap<String, String>map = new HashMap<String, String>(); map.put("1", "A"); map.put("6", "B"); map.put("3", "C"); map.put("7", "D"); map.put("5", "E"); map.put("2", "F"); map.put("4", "G"); map.put("8", "H");

Now, sort the above Map. The result of tMap below would be a sorted map by key −

Map<String, String>tMap = new TreeMap<String, String>(map);

Example

 Live Demo

import java.util.HashMap; import java.util.Map; import java.util.TreeMap; public class Demo {    public static void main(String[] args) {       HashMap<String, String>map = new HashMap<String, String>();       map.put("1", "A");       map.put("6", "B");       map.put("3", "C");       map.put("7", "D");       map.put("5", "E");       map.put("2", "F");       map.put("4", "G");       map.put("8", "H");       Map<String, String>tMap = new TreeMap<String, String>(map);       System.out.println("Sorted Map values: "+tMap);    } }

Output

{1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H}