New to Java

Hi guys,

I'm doing an exercise. I want to get a TreeMap sorted by keys and print it out. I thought I can just assign a HashMap instance to a TreeMap instance and it will be sorted automatically, but it doesn't work. This is the code:

public class Main {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("One", "1");
        map.put("Two", "2");
        map.put("Three", "3");
        map.put("Four", "4");
        map.put("Five", "5");
        
        System.out.println(map);

        Map<String, String> treeMap = new TreeMap<String, String>();

        treeMap = map;

        System.out.println(treeMap);
    }
}

And this is the output:

{Five=5, Three=3, One=1, Four=4, Two=2}
{Five=5, Three=3, One=1, Four=4, Two=2}

How can I sort a TreeMap or a HasMap object? So far I only found Collections.sort() but it works only for a List.

Thanks,

PR.

Edited by: Aardenon on Feb 17, 2011 1:21 PM

Edited by: Aardenon on Feb 17, 2011 1:22 PM