// The list-based set
public class LBS {
   protected ListOfObjects ls;

   public LBS() {  ls = new ListOfObjects(); }

   public int sizeOf() { 
      int ans = 0;
      ls.reset();
      while (!ls.atEnd()) {
         ++ans;
         ls.next();
      }
      return ans;
   }

   public boolean isEmpty() { return sizeOf() == 0; }


   public Element[] getContents() {
      Element[] ans = new Element[sizeOf()];
      int loc = 0;
      ls.reset();
      while (!ls.atEnd()) {
         ans[loc++] = (Element) ls.getItem();
         ls.next();
      }
      return ans;
   }

   public String toString() { return "Set " + ls; }
   
}