排序（对对象进行排序）二

╰半夏微凉° 2022-06-08 04:25 168阅读 0赞

### 功能：通过java对对象按生日时间进行升序排序 ###

### 代码块 ###

**User .java**

package com.yubai;
    
    /** * Created by bayu on 9/13/2017. */
    public class User { 
        private String name;
        private String sex;
        private int age;
        private String birthday;
    
        public User(String name, String sex, int age, String birthday) {
            this.name = name;
            this.sex = sex;
            this.age = age;
            this.birthday = birthday;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getSex() {
            return sex;
        }
    
        public void setSex(String sex) {
            this.sex = sex;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public String getBirthday() {
            return birthday;
        }
    
        public void setBirthday(String birthday) {
            this.birthday = birthday;
        }
    }

**SortClass .java**

package com.yubai;
    
    import java.util.Comparator;
    
    /** * Created by bayu on 9/13/2017. */
    public class SortClass implements Comparator{ 
    
        @Override
        public int compare(Object o1, Object o2) {
            User u1 = (User)o1;
            User u2 = (User)o2;
            return u1.getBirthday().compareTo(u2.getBirthday());
        }
    }

**UserTest .java**

package com.yubai;
    
    import java.util.ArrayList;
    import java.util.Collection;
    import java.util.Collections;
    import java.util.List;
    
    /** * Created by bayu on 9/13/2017. */
    public class UserTest { 
        public static void main(String[] args) {
            List<User> userList = new ArrayList<User>();
            userList.add(new User("吴光雷", "男", 25, "19871028"));
            userList.add(new User("吴桥", "男", 22, "19900923"));
            userList.add(new User("陆晓敏", "男", 25, "19870728"));
            userList.add(new User("王佳俊", "男", 23, "19890728"));
            userList.add(new User("秦菁", "女", 23, "19891212"));
    
            SortClass sort = new SortClass();
            Collections.sort(userList,sort);
            for (User u:userList) {
                System.out.println(u.getName()+","+u.getSex()+","+u.getAge()+","+u.getBirthday());
            }
    
        }
    }