public class UnOrdListIntSet extends ListBasedIntSet {

   public UnOrdListIntSet() {
      super();
   }

   /* 
    *   Return a new empty set, of the same implementation as "this" one
    */

   protected IntSet newEmptySet() {
      return new UnOrdListIntSet();
   }

   /* A helper method to locate the List container of an int */

   protected List locate(int n) {
       List finger = list;
       while (finger != null) {
          int i = getInt(finger);
          if (i == n) return(finger);
          finger = finger.getRest();
       }
       return null;
   }

   public void insert(int n) {
      if (locate(n) == null) {
         list = new List(new Integer(n), list);
      }
   }

   public void delete(int n) {
      List lookup = locate(n);
      if (lookup != null) {
         lookup.exchange(list.find(1));
         list = list.getRest();
      }
   }

   public static void main(String args[]) {
      UnOrdListIntSet uols = new UnOrdListIntSet();
      uols.selfTest();
   }

}