哔哩哔哩韩老师（作业https://www.bilibili.com/video/BV1fh411y7R8?p=356&spm_id_from=pageDriver）

 

 本方法中仅toString方法与老韩不同（先写后悟

package com.javase.project.text02;

import java.lang.reflect.Array;
import java.sql.SQLOutput;
import java.util.Arrays;

/**
 * Copyright (C), 2018-2021, Mr.Lin
 * Author: Mr.Lin
 * Date: 2021/11/12 9:37
 * FileName: Message
 * Description:
 */
public class Message {
    public static void main(String[] args) {
        Person persons[] = new Person[4];
        persons[0] = new Student("小明", 15, '男', "足球", "00023102");
        persons[1] = new Student("小张", 19, '女', "跳舞", "00023203");
        persons[2] = new Teacher("张飞", 30, '男', "象棋", 5);
        persons[3] = new Teacher("六小三", 32, '女', "麻将", 7);

        System.out.println(persons[0]);
        System.out.println("++++++++++++++++++++++++++++++++");
        System.out.println(persons[1]);
        System.out.println("++++++++++++++++++++++++++++++++");
        System.out.println(persons[2]);
        System.out.println("++++++++++++++++++++++++++++++++");
        System.out.println(persons[3]);

        System.out.println("++++++++++++++++++++++++++++++++");
        System.out.println("按年龄由高到低：");
        Message message = new Message();
        message.bubbleSort(persons);
        for (int i = 0; i < persons.length; i++) {
            System.out.println(persons[i].getName());
        }
        System.out.println("++++++++++++++++++++++++++++++++");
        for (int i = 0; i < persons.length; i++) {
            message.text(persons[i]);
        }

    }

    public void bubbleSort(Person[] persons) {
        Person temp = null;
        for (int i = 0; i < persons.length - 1; i++) {
            for (int j = 0; j < persons.length - 1 - i; j++) {
                if (persons[j].getAge() < persons[j + 1].getAge()) {
                    temp = persons[j + 1];
                    persons[j + 1] = persons[j];
                    persons[j] = temp;
                }
            }
        }
    }
    public void text(Person p){
        if(p instanceof Student){
            System.out.println(((Student) p).study());
        }else if (p instanceof Teacher) {
            System.out.println(((Teacher) p).teach());
        }else {
            System.out.println("do_nothing");
        }
    }
}

package com.javase.project.text02;

/**
 * Copyright (C), 2018-2021, Mr.Lin
 * Author: Mr.Lin
 * Date: 2021/11/12 9:17
 * FileName: Person
 * Description:
 */
public class Person {
    private String name;
    private Integer age;
    private char sex;
    private String event;


    public Person() {
    }

    public Person(String name, Integer age, char sex, String event) {
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.event = event;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public char getSex() {
        return sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }

    public String getEvent() {
        return event;
    }

    public void setEvent(String event) {
        this.event = event;
    }

    public String play() {
       return name + "爱玩" + event;
    }

    @Override
    public String toString() {
        return
                "姓名:" + name + '\n' +
                "年龄:" + age + '\n' +
                "性别:" + sex ;
    }
}

package com.javase.project.text02;

/**
 * Copyright (C), 2018-2021, Mr.Lin
 * Author: Mr.Lin
 * Date: 2021/11/12 9:12
 * FileName: Student
 * Description: 学生类
 */
public class Student extends Person{
    private String stu_id;

    public Student(String name, Integer age, char sex, String event, String stu_id) {
        super(name, age, sex, event);
        this.stu_id = stu_id;
    }

    public String getStu_id() {
        return stu_id;
    }

    public void setStu_id(String stu_id) {
        this.stu_id = stu_id;
    }
    public String play() {
       return getName() + "爱玩" + getEvent();
    }

    @Override
    public String toString() {
        return "学生信息：\n"+super.toString() +
                "\n学号：" + stu_id+"\n"+study()+"\n"+play()+".";

    }

    public String study(){
       return "我承诺我会好好学习";
    }


}

package com.javase.project.text02;

/**
 * Copyright (C), 2018-2021, Mr.Lin
 * Author: Mr.Lin
 * Date: 2021/11/12 9:16
 * FileName: Teacher
 * Description: 老师类
 */
public class Teacher extends Person{
    public Integer work_age;

    public Teacher(String name, Integer age, char sex, String event, Integer work_age) {
        super(name, age, sex, event);
        this.work_age = work_age;
    }

    public Integer getWork_age() {
        return work_age;
    }

    public void setWork_age(Integer work_age) {
        this.work_age = work_age;
    }
    public String play() {
        return getName() + "爱玩" + getEvent();
    }
    @Override
    public String toString() {
        return "老师信息：\n"+super.toString() +
                "\n工龄：" + work_age+"\n"+teach()+"\n"+play()+".";
    }

    public String teach() {
        return  "我承诺，我会认真教书";
    }



}

 

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