class StringLink
   {
   public String sData;              // data item (key)
   public StringLink next;              // next link in list
// -------------------------------------------------------------
   public StringLink(String id, StringLink newNext) // constructor
      {
      sData = id;
      next = newNext;
      }
// -------------------------------------------------------------
   public void displayLink()      // display ourself
      {
      System.out.print("{" + sData + "} ");
      }
   }  // end class Link