Reorder a HashMap by its greater key

Question

Supposing that I have a hashmap with the following structure:

HashMap<int, String> players = new HashMap<int, String>();
players.put(2, 'player1');
players.put(1, 'player2');
players.put(4, 'player3');
players.put(3, 'player4');
players.put(5, 'player5');

How can I output it like this with a for loop?

5, player5
4, player3
3, player4
2, player1
1, player2

use a Treemap: http://stackoverflow.com/questions/922528/how-to-sort-map-values-by-key-in-java — s_bei, Jan 30 '15 at 13:47

score 4 · Accepted Answer · answered Jan 30 '15 at 13:48

You can create a TreeMap<k,v> with the existing HashMap

   Map<int, String> newMap = new TreeMap(Collections.reverseOrder());
    newMap.putAll(players);

So that your existing players map is unchanged. And you get the newMap sorted in descending order

Reorder a HashMap by its greater key

1 Answers1