List Map 排序

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import java.util.*;   public class Test {     public static void main(String[] args) {         List<Map<String, Object>> list = new ArrayList<>();         Map<String, Object> item1 = new HashMap<>();         item1.put("time", "2023-07-19 08:00:00");         list.add(item1);           Map<String, Object> item2 = new HashMap<>();         item2.put("time", "2023-07-20 08:00:00");         list.add(item2);             Map<String, Object> item3 = new HashMap<>();         item3.put("time", "2023-07-15 08:00:00");         list.add(item3);           Map<String, Object> item4 = new HashMap<>();         item4.put("time", "2023-07-15 07:00:00");         list.add(item4);           // 对list按照time进行排序         Collections.sort(list, new Comparator<Map<String, Object>>() {             public int compare(Map<String, Object> o1, Map<String, Object> o2) {                 String time1 = (String) o1.get("time");                 String time2 = (String) o2.get("time");                 return time1.compareTo(time2);             }         });           for (Map<String, Object> m : list) {             System.out.println(m.get("time").toString());         }     }   }