对Map排序

 一下代码为给一个hashMap的key排序，value排序一样处理

public static List<Map.Entry<String, Integer>> sortHashMapInteger(HashMap<String, Integer> map, final String dateFormat) {
    List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
    // 排序
    Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
      public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
        //return ( o1.getKey()-o2.getKey());
        String key1 = o1.getKey();
        String key2 = o2.getKey();
        Date day1 = null;
        Date day2 = null;
        try {
          day1 = DateUtils.getDateByFormat(key1, dateFormat);
          day2 = DateUtils.getDateByFormat(key2, dateFormat);
        } catch (Exception e) {
          e.printStackTrace();
        }
         
        return (day1.after(day2) == true ? 1 : 0);
      }
    });
    return list;
  }