Putting Duplicate Keys in a Hashtable.Please assist

Question

Folks,
I wud like to put duplicate keys into a Hashtable,so that the Hashtable looks like:
Entertainment,Video;
Entertainment,Pictures;
Entertainment,Camera;
where Entertainment is the key:
So I am using the flwg code:
public class TestHashTable {
public static void main(String[] args){
  Hashtable balance = new Hashtable();
  HashMap hm = new HashMap();
  Enumeration names;
  String str;
  balance.put("Entertainment",helperMethodAddToList(hm, "Entertainment", "Camera"));
  balance.put("Entertainment",helperMethodAddToList(hm, "Entertainment", "Video"));
  balance.put("Entertainment",helperMethodAddToList(hm, "Entertainment", "Pictures"));
   names = balance.keys();
   while(names.hasMoreElements()){
   str = (String)names.nextElement();
   System.out.println(str + ":" + balance.get(str));     
   } // End of main.
   private static List helperMethodAddToList(Map m, String key, String value) {
   List vals = (List)m.get(key);
   if (vals == null) {
   vals = new LinkedList();
   m.put(key, vals);
   vals.add(value);
   return vals;
   }The output comes this way:
Entertainment:[Camera, Video, Pictures]
I dont want it this way but as shown on 1st Line
Is this possible? Am I missing something?

Answer 1

import java.util.*;
public class X {
    public static void main(String[] args) {
        HashMap map = new HashMap();
        map.put("a", toList(new String[] {"alabama", "arkansas", "alaska"}));
        map.put("n", toList(new String[] {"nevada", "new mexico", "north dakota"}));
        map.put("w", toList(new String[] {"wyoming", "west virgina"}));
        dump(map);
    static List toList(String[] strings) {
        return new ArrayList(Arrays.asList(strings));
    static void dump(Map map) {
        for(Iterator i = map.entrySet().iterator(); i.hasNext(); ) {
            Map.Entry entry = (Map.Entry) i.next();
            System.out.print("key=" + entry.getKey() + ", values=");
            List values = (List) entry.getValue();
            for(Iterator j=values.iterator(); j.hasNext(); ) {
                String state = (String) j.next();
                System.out.print(state + ", ");
            System.out.println();
}