public class ListEntry<K, V> implements Entry<K,V>
{
   private  K key; 
   private  V value; 

   public  ListEntry<K,V> prev;    // ListEntry needs links !!
   public  ListEntry<K,V> next;

   public ListEntry(K k, V v)
   {
      key = k;
      value = v;
      prev = null;
      next = null;
   }


   /** Returns the key stored in this entry. */
   public K getKey()
   {
      return key;
   }

   /** Returns the value stored in this entry. */
   public V getValue()
   {
      return value;
   }

   public V setValue(V val)
   {
      V oldValue = value;

      value = val;                // Update value
      return oldValue;            // Return old value
   }

   public String toString()
   {
      return( "[" + key + "," + value + "]" );
   }
}