how to sort hashmap by values?

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How to sort a Map<Key, Value> on the values in Java?

I need to sort my hashmap according to the values stored in it. The hashmap contains the contacts name stored in phone.also I need that the keys get automatically sorted as soon as I sort the values.or you can say the keys and values are bounded together thus any changes in values should get reflected in keys.

 HashMap<Integer,String> map = new HashMap<Integer,String>();
    map.put(1,froyo);
    map.put(2,abby);
    map.put(3,denver);
    map.put(4,frost);
    map.put(5,daisy);

required output:

2,abby;
5,daisy;
3,denver;
4,frost;
1,froyo;

And also a near-exact duplicate of a question posted earlier today. -1 for reposting without even fixing the errors in the example. — Fred Foo, Nov 14 '11 at 11:56
it would be nice if you could have provided the answer..and by the way what errors in the example are you talking about. — moderator_edited_name, Nov 14 '11 at 12:01

Joop Eggen · Answer 1 · 2011-11-14T12:15:11.497

0

private static class MyMapComparator implements Comparator<Map.Entry<Integer, String>>
{
    @Override
    public int compare(Map.Entry<Integer, String> a, Map.Entry<Integer, String> b) {
        return a.getValue().compareTo(b.getValue());
    }
}
...

List<Map.Entry<Integer, String>> entries = new ArrayList<Map.Entry<Integer, String>>(map.entries());
Collections.sort(entries, new MyMapComparator());

edited Nov 14 '11 at 12:15

answered Nov 14 '11 at 12:08

Joop Eggen

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how to sort hashmap by values?

1 Answers1