ArrayList排序

package com.xzz.jihepaixu;

import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.Data;
import lombok.ToString;
import java.util.Date;

import java.io.Serializable;


@Data
@ToString
public class JiHe implements Serializable, Comparable{

    @JsonIgnore
    private Date endTime;


    @Override
    public int compareTo(JiHe o) {
       return  endTime.compareTo(o.getEndTime());
    }
}

package com.xzz.jihepaixu;

import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.Data;
import lombok.ToString;

import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;



public class JiHeTest{

    public static void main(String[] args) throws ParseException {
        List arrayList = new ArrayList<>();
        JiHe jiHe = new JiHe();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
        Date parse = simpleDateFormat.parse("20210930000000");
        jiHe.setEndTime(parse);
        JiHe jiHe1 = new JiHe();
        SimpleDateFormat simpleDateFormat2 = new SimpleDateFormat("yyyyMMddHHmmss");
        Date parse1 = simpleDateFormat2.parse("20211231235959");
        jiHe1.setEndTime(parse1);
        arrayList.add(jiHe);
        arrayList.add(jiHe1);
        //默认排序 从大往小排序
        Collections.sort(arrayList);
        System.out.println(arrayList);


    }

}