ctciCh2Q1

    public static void removeDuplicate(List<Integer> l){
        Hashtable table = new Hashtable();
        for(Iterator<Integer> iter = l.iterator();iter.hasNext();){
            Integer i = iter.next();
            if(table.containsKey(i)){
                iter.remove();
            }else{
                table.put(i, true);
            }
        }
    }