java 根据类中LocalDateTime排序类集合

Posted 2021-07-20 孤注一掷 、

用到了该函数

//localDateTime和localDateTime2是两个类对象
//两个LocalDateTime的值比较，localDateTime较大则 flag = 1；否则为-1
int flag = localDateTime.compareTo(localDateTime2);

完整排序

//对记录进行时间排序的方法eventData(List<Event> eventList)
    public static List<Event> eventData(List<Event> eventList) {
        Collections.sort(eventList, new Comparator<Event>() {
            @Override
            public int compare(Event e1, Event e2) {
                int diff = e1.getStartTime().compareTo(e2.getStartTime());
                if (diff>0){
                    return -1;
                }else if (diff<0){
                    return 1;
                }
                return 0;//相等为0
            }
        });
        return eventList;
    }