java集合list按时间排序降序

按照时间降序排序，可以在Comparator对象的compare()方法中反转比较结果，示例代码如下：

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<MyEntity> list = new ArrayList<>();
        list.add(new MyEntity("2021-01-01 10:00:00"));
        list.add(new MyEntity("2021-01-02 12:00:00"));
        list.add(new MyEntity("2021-01-03 08:00:00"));

        Collections.sort(list, new Comparator<MyEntity>() {
            @Override
            public int compare(MyEntity o1, MyEntity o2) {
                return o2.getTime().compareTo(o1.getTime()); // 反转比较结果
            }
        });

        for (MyEntity e : list) {
            System.out.println(e.getTime());
        }
    }
}

class MyEntity {
    private String time;

    public MyEntity(String time) {
        this.time = time;
    }

    public String getTime() {
        return time;
    }
}

输出结果为：

2021-01-03 08:00:00
2021-01-02 12:00:00
2021-01-01 10:00:00