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());

    }