JAVA代码实现按列表中元素的时间字段排序

刺骨的言语ヽ痛彻心扉 2023-03-03 12:26 8阅读 0赞

@Data
    @AllArgsConstructor
    public class User1 {
        private String name;
        private String birthday;
    
    }

public class SortUser {
    
    
      public static void main(String[] args) {
    
        List<User1> list = new ArrayList<>();
    //    list.add(new User1("张三", "1987-05-23 12:34:07"));
    //    list.add(new User1("李四", "1977-05-23 05:04:07"));
    //    list.add(new User1("王五", "1987-05-23 09:34:07"));
    
    
        list.add(new User1("王五1", "2020-03-01"));
        list.add(new User1("王五2", "2020-12-31"));
        list.add(new User1("王五3", "2020-10-23"));
        list.add(new User1("王五4", "2020-05-01"));
        list.add(new User1("王五5", "2020-10-31"));
    
    
        //(1)顺序排列
        list.sort(Comparator.comparing(User1::getBirthday));
    
        //(2)输出list
        System.out.println("排序后1："+list);
    
        //(3)倒序排列
        Collections.reverse(list);
    
        //(4)输出list
        System.out.println("排序后2："+list);
      }
    }

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> 工作中遇到一个问题，调用第三方接口返回的数据没有按时间倒序排列，测试说要加，然后在网上找到一个解决办法，这里记录一下

### **需求：** ###

*  如下图列表，按生日进行倒序排列  
    [![format_png][]][format_png 1]

### **用户类** ###

@Data

@AllArgsConstructor

public class User \{

private String name;

private String birthday;

### **测试类** ###

@SpringBootTest

@Slf4j

public class TestSort \{

private List<User> list = new ArrayList<>();

@BeforeEach

void setUp() \{

list.add(new User("张三", "1987-05-23 12:34:07"));

list.add(new User("李四", "1977-05-23 05:04:07"));

list.add(new User("王五", "1987-05-23 09:34:07"));

@Test

@DisplayName("测试排序")

void test() \{

// (1)顺序排列

list.sort(Comparator.comparing(User::getBirthday));

// (2)倒序排列

Collections.reverse(list); //

(3)输出list

log.info("排序后："+list);

### **测试结果** ###

[![format_png 2][]][format_png 2 1]

### **参考资料** ###

[Java实现 根据list列表元素的时间字段进行排序][Java_ _list]

[format_png]: /images/20230208/b4d5e1ec8f084f8d9049213d06531605.png
[format_png 1]: https://img2018.cnblogs.com/blog/1383283/201911/1383283-20191112171209508-433763699.png
[format_png 2]: /images/20230208/7230640afbd84576b7af937fa4a7e9a4.png
[format_png 2 1]: https://img2018.cnblogs.com/blog/1383283/201911/1383283-20191112173012725-1319849615.png
[Java_ _list]: https://blog.csdn.net/baidu_15338861/article/details/86227575