class Link
   {
   public int iData;              // data item (key)
   public double dData;           // data item
   public Link next;              // next link in list
// -------------------------------------------------------------
   public Link(int id, double dd) // constructor
      {
      iData = id;
      dData = dd;
      }
// -------------------------------------------------------------
   public void displayLink()      // display ourself
      {
      System.out.print("{" + iData + ", " + dData + "} ");
      }
   }  // end class Link