list 排序

Collections.sort(list, new Comparator<Map<String, Object>>() {
   @Override
   public int compare(Map<String, Object> o1, Map<String, Object> o2) {
      Date date1 =  (Date)o1.get("date");
      Date date2 =  (Date)o2.get("date");
      return date2.compareTo(date1);
   }
});