Collections.sort(resultList, new Comparator
     
      
       >() {@Overridepublic int compare(HashMap
       
         o1, HashMap
        
          o2) {Date time1 = (Date) o1.get("submit_time");Date time2 = (Date) o2.get("submit_time");if (null == time1) {return -1;}if (null == time2) {return 1;}return time1.compareTo(time2);}});return ResultMessage.getSuccess().setData(resultList);}