sort根据多属性排序

        Collections.sort(reservations, (o1, o2) -> {
            String dateOne = ((JSONObject) o1).getJSONObject("time_info").getString("start_time");
            String dateTwo = ((JSONObject) o2).getJSONObject("time_info").getString("start_time");
            if(dateOne.compareTo(dateTwo) == 0){
                String code1 = ((JSONObject) o1).getJSONArray("products").getJSONObject(0).getJSONArray("components").getJSONObject(0).getJSONArray("operations").getJSONObject(0).getJSONObject("staff").getString("code");
                String code2 = ((JSONObject) o2).getJSONArray("products").getJSONObject(0).getJSONArray("components").getJSONObject(0).getJSONArray("operations").getJSONObject(0).getJSONObject("staff").getString("code");
                return Integer.valueOf(code1).compareTo(Integer.valueOf(code2));
            }else {
                return dateOne.compareTo(dateTwo);
            }
        });