public class ListElem
{
   public  String key; 
   public  String value; 

   public  ListElem prev;        // Double linked list for easy deletion
   public  ListElem next;

   public ListElem(String k, String v)
   {
      key = k;
      value = v;
      prev = null;
      next = null;
   }

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