Hash table

import java.util.*;


public class SortHashtabledesc {

public static void main(String[] args) {
// Create and populate hashtable
Hashtable ht = new Hashtable();
ht.put("abc",new Double(3445.23));
ht.put("xyz",new Double(2333.56));
ht.put("pqr",new Double(3900.88));
ht.put("mno",new Double(2449.00));

// Sort hashtable.
Vector v = new Vector(ht.keySet());
Collections.sort(v, Collections.reverseOrder());

// Display (sorted) hashtable.
for (Enumeration e = v.elements(); e.hasMoreElements();) {
String key = (String)e.nextElement();
System.out.println(key+":"+ht.get(key));


System.out.println();
}
}
}