Best way to declare static map

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

public class StaticMapDemo {

      public static final Map<Integer, String> NUMBERS = Collections.unmodifiableMap(getNumbers());

     

      private static Map<Integer, String> getNumbers(){

            Map<Integer,String> map = new HashMap<Integer, String>();

            map.put(1, "one");

            map.put(2, "two");

            map.put(3, "three");

            return map;

      }

     

      public static void main(String[] args) {

            System.out.println(StaticMapDemo.NUMBERS);

      }

}

Output:

{1=one, 2=two, 3=three}