sortedMap in reverse order?

[sensory21]

Hi,
This is a sorting by keys' natural ordering (ascending) and I need to have also the descending order, can someone help?
I've looked at comparator and again at:
Map map = new TreeMap(Collections.reverseOrder());
but I haven't managed to make it work?

SortedMap sortedMap = new TreeMap();
sortedMap.putAll(ht);
Iterator iter = sortedMap.keySet().iterator();
while (iter.hasNext())
{
	String key = (String)iter.next();
	out.println(sortedMap.get(key));
}//end while

 

[sedj]

Works for me :

		Hashtable ht = new Hashtable();
		ht.put("10", "<tr><td>abc</td><td> def</td></tr>");
		ht.put("30", "<tr><td>abc</td><td> def</td></tr>");
		ht.put("20", "<tr><td>abc</td><td> def</td></tr>");
		ht.put("40", "<tr><td>abc</td><td> def</td></tr>");

		SortedMap sortedMap = new TreeMap();
		sortedMap.putAll(ht);

		Iterator iter = sortedMap.keySet().iterator();
		while (iter.hasNext()) {
			Object key = iter.next();
			System.err.println(key +"=" +sortedMap.get(key));
		}

		System.err.println();

		sortedMap = new TreeMap(Collections.reverseOrder());
		sortedMap.putAll(ht);
		iter = sortedMap.keySet().iterator();
		while (iter.hasNext()) {
			Object key = iter.next();
			System.err.println(key +"=" +sortedMap.get(key));
		}

--------------------------------------------------
Free Database Connection Pooling Software

http://www.primrose.org.uk

 

[byam]

What object are you trying to sort? Does it implements Comparable correctly?