import java.util.*;
public class SortHashtable {
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);
// 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();
}
}
}