升序排法
staffArray.sort(Comparator.comparing(obj -> ((JSONObject) obj).getBigDecimal("orderAmt")));
降序排列
staffArray.sort(Comparator.comparing(obj -> ((JSONObject) obj).getBigDecimal("orderAmt")).reversed());
list 转map
map = data.stream().collect(Collectors.groupingBy(BelloResumeInterviewResp::getWhen, Collectors.toList()));
// map = data.stream().collect(Collectors.toMap(BelloResumeInterviewResp::getWhen, Function.identity(),(existing, replacement) -> existing));
