public class GetNth implements IFunAlgo {
   private static GetNth _instance = new GetNth ();

   private GetNth () {
   }

   public static GetNth Singleton () {
      return _instance;
   }

   public Object forEmpty (EmptyFW list, Object input) {
      throw new java.util.NoSuchElementException ("Empty has no data.");
   }

   public Object forCons (ConsFW list, Object input) {
      int n = ((Integer)input).intValue ();
      if (0 == n)
      {
         return list.car ();
      }
      else
      {
         return list.cdr ().execute (this, new Integer (--n));
      }
   }
}