image.png

Collections.sort(list, new Comparator<Map<String, Object>>(){

        public int compare(Map<String, Object> o1, Map<String, Object> o2) {
            String ls1 =(String)o1.get("start_time");//ls1是从list里面拿出来的一个map
            String ls2= (String)o2.get("start_time"); //ls2是从list里面拿出来的第二个map
            return ls2.compareTo(ls1);
        }

    });