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import java.util.Set;import java.util.*;/** * Write a description of class ArrayListSet here. *  * @author Jerediah Fevold  * @version 13 November 2006 */public class ArrayListSet{    // instance variables - replace the example below with your own    ArrayList set;    boolean presence;        /**     * Constructor for objects of class ArrayListSet     */    public ArrayListSet()    {        set = new ArrayList();    }    public boolean add(Object o)    {        if(set.contains(o) == false)            { set.add(o); }        else{presence = true;}                return presence;                }        public boolean contains(Object o)    {        return set.contains(o);            }        public boolean remove(Object o)    {        if(set.contains(o) == true)        {            presence = true;            set.remove(set.indexOf(o));        }                else        {            presence = false;        }                return presence;          }        public int size()    {        return set.size();    }        public Iterator iterator()    {    }    }