list 集合排序

  @Test
    public  void listrAsc(){
        List<Map<String, String>> accountList = new ArrayList<>();
        Map<String, String> map = null;
        for (int i = 0; i < 5; i++) {
            map = new HashMap<>();
            map.put("accountNum", "qq100000" + i);
            map.put("createTime", "2018-01-1" + i);
            accountList.add(map);
        }

        SortClass sort = new SortClass();
        Collections.sort(accountList, sort);
        for (int i = 0; i < accountList.size(); i++) {
            Map mapInfo = accountList.get(i);
            System.out.println("账号:" + mapInfo.get("accountNum")
                    + ", 创建日期:" + mapInfo.get("createTime"));
        }
       // log.info("参数"+ JSON.toJSONString(resultIf));
    }
    /**
     * @ClassName: SortClass
     * @Description: 按时间降序排列
     * @date: 
     */
  public  static class SortClass implements Comparator {
        @Override
        public int compare(Object obj0, Object obj1) {
            Map<String, String> map0 = (Map) obj0;
            Map<String, String> map1 = (Map) obj1;
            int flag = map0.get("createTime").toString().compareTo(map1.get("createTime").toString());
            return -flag; // 不取反，则按正序排列
        }
    }