【Stream流】使用Stream流对字符串时间做排序

【Stream流】使用Stream流对字符串时间做排序

前言: 废话不多说,直接上代码

package com.goodstudy.other.test;

import com.alibaba.fastjson.JSON;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class StreamSortedTest {

    /**
     * stream流对字符串时间集合(按时间倒序)排序
     */
    public static void main(String[] args) {
        List<User> list=new ArrayList<User>();
        User user = new User();
        user.setUserId("1001");
        user.setCreateDateStr("2024/12/11 12:15:50");

        User user2 = new User();
        user2.setUserId("1011");
        user2.setCreateDateStr("2023/01/11 16:15:50");

        User user3 = new User();
        user3.setUserId("1021");
        user3.setCreateDateStr("2022/12/30 09:15:50");

        list.add(user);
        list.add(user2);
        list.add(user3);

        list=list.stream().sorted(Comparator.comparing(User::getCreateDateStr).reversed()).collect(Collectors.toList());
        System.out.println(JSON.toJSON(list));
    }

    public static class User{
        private String userId;
        private String createDateStr;

        public String getUserId() {
            return userId;
        }

        public void setUserId(String userId) {
            this.userId = userId;
        }

        public String getCreateDateStr() {
            return createDateStr;
        }

        public void setCreateDateStr(String createDateStr) {
            this.createDateStr = createDateStr;
        }
    }
}

备注:
.reversed() 指倒序排序,没有添加这个,默认升序

控制台打印结果:

[{"createDateStr":"2024/12/11 12:15:50","userId":"1001"},{"createDateStr":"2023/01/11 16:15:50","userId":"1011"},{"createDateStr":"2022/12/30 09:15:50","userId":"1021"}]