java去掉数组中重复的元素

 public static void main(String[] args)    {        String[] stringtmp = { "1", "2", "3", "2" };        Map<String, String> map = new HashMap<String, String>();        for (int i = 0; i < stringtmp.length; i++)        {            map.put(stringtmp[i], stringtmp[i]);        }        System.out.println(map.size());    }