如何使用 Java 对 List 中每个对象元素按时间顺序进行排序

如何使用 Java 对 List 中每个对象元素按时间顺序进行排序

Java 实现

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class TestListSort {
    private static class UserBean {
        private String id;
        private String birthday;

        public String getId() {
            return id;
        }

        void setId(String id) {
            this.id = id;
        }

        String getBirthday() {
            return birthday;
        }

        void setBirthday(String birthday) {
            this.birthday = birthday;
        }

        // 重写 toString() 方法
        public String toString() {
            return "id：" + id + ", birthday：" + birthday;
        }
    }

    public static void main(String[] args) {
        List<UserBean> list = new ArrayList<>();
        UserListGenerate(list);
        System.out.println("排序前：" + list);
        ListSort(list);
        System.out.println("排序后：" + list);
    }

    private static void UserListGenerate(List<UserBean> list) {
        UserBean user1 = new UserBean();
        UserBean user2 = new UserBean();
        UserBean user3 = new UserBean();
        user1.setId("zhagnsan");
        user1.setBirthday("1980-11-01");

        user2.setId("lisi");
        user2.setBirthday("1981-12-01");

        user3.setId("wangwu");
        user3.setBirthday("1980-12-01");

        list.add(user1);
        list.add(user2);
        list.add(user3);
    }

    private static void ListSort(List<UserBean> list) {
        list.sort((o1, o2) -> {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            try {
                Date dt1 = format.parse(o1.getBirthday());
                Date dt2 = format.parse(o2.getBirthday());
                return Long.compare(dt1.getTime(), dt2.getTime());
            } catch (Exception e) {
                e.printStackTrace();
            }
            return 0;
        });
    }
}

运行结果

排序前：[id：zhagnsan, birthday：1980-11-01, id：lisi, birthday：1981-12-01, id：wangwu, birthday：1980-12-01]
排序后：[id：zhagnsan, birthday：1980-11-01, id：wangwu, birthday：1980-12-01, id：lisi, birthday：1981-12-01]

参考资料

• https://blog.csdn.net/wangjie1616/article/details/70196683