/**
  * Undocumented Set example for illustrating AF and RI
  * CS/SWE 332, Fall 2011
  */

import java.util.*;

public class LSet<E> {

   private List<E> elements;
   //private int size;       // possible extra instance variable

   public LSet() {   
      this.elements = new ArrayList<E>();
      //size = 0;
   }

   public void insert (E e) {
     if (!(isIn(e))) {
        elements.add(e);
        //size ++;
     }
   }

   public void remove (E e) {
      elements.remove(e);
      // what to do with size?
   }

   public boolean isIn(E e) {
      return elements.contains(e);
   }

   public int size() {
      return elements.size();
      //return size;
   }

   @Override
   public String toString() {
      String result = "[";
      for (int i = 0; i < elements.size(); i++) {
         E item = elements.get(i);
         if (i < elements.size()-1)
            result += item + ", ";
         else
            result += item;
      }
      return result + "]";
   }

  public static void main(String[] args) {
     // Simple exercise to enQueue/deQueue cmd line args
     // Usage:  java Queue item1 item2 item3 ...
     LSet <String> s = new LSet <String>();
     for (String arg : args) {
        s.insert(arg);
     }
     System.out.println("s " + s);
  }

}