import java.util.*;

public class DupHashtable implements Enumeration {

  // Put a key-value combination into the hashtable.
  public void put (Object key, Object value)
  {
  }
  
  // Given a key, return the (zero, one or many) values
  // associated with the key.
  public LinkedList get (Object key)
  {
  }

  // Return the number of values stored.
  public int size () 
  {
  }


  // Return an Enumeration of values in the hashtable.
  // This interface is to be implemented by DupHashtable itself.
  public Enumeration allValues ()
  {
  }
  
  
  // One of the two methods in the Enumeration interface.
  public boolean hasMoreElements ()
  {
  }
  
  // One of the two methods in the Enumeration interface.
  public Object nextElement ()
  {
  }


  // Some testing ...
  public static void main (String[] argv) 
  {
    // Test 1:
    DupHashtable dup = new DupHashtable ();
    dup.put ("A", "AAA");
    printTable (dup);

    // Test 2:
    dup = new DupHashtable ();
    dup.put ("A", "AAA");
    dup.put ("B", "BBB");
    dup.put ("C", "CCC");
    printTable (dup);

    // Test 3:
    dup = new DupHashtable ();
    dup.put ("A", "AAA");
    dup.put ("B", "BBB");
    dup.put ("C", "CCC");
    dup.put ("A", "AAAAA");
    dup.put ("C", "CCCCC");
    printTable (dup);
  }

  public static void printTable (DupHashtable dup)
  {
    System.out.println ("Hashtable with " + dup.size() + " values: ");
    Enumeration e = dup.allValues ();
    while (e.hasMoreElements()) {
      System.out.println (e.nextElement());
    }
  }
  

}