How to iterate hashmap in reverse order in Java

Question

I am trying this for some hour but not finding any best approach to achieve iteration of hashmap in reverse order, this is the hashmap I have.

      Map

        

Answer 1

    TreeMap map = new TreeMap();
    map.put(1, "abc1");
    map.put(2, "abc2");
    map.put(3, "abc3");
    NavigableMap nmap = map.descendingMap();
    for (NavigableMap.Entry entry : nmap.entrySet()) {
        System.out.println("Key : " + entry.getKey() + " Value : " + entry.getValue());
    }

An implementation of NPE idea.