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【韩顺平Java笔记】第8章：面向对象编程（中级部分）【354-358】

article 2025/3/4 5:28:40

354. 355. 本章作业14 15

Person.java

package com.m.homework13;

public class Person {
    private String name;
    private int age;
    private char gender; //性别

    public Person(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public void play(){
        System.out.print(name + "爱玩");
    }

    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }

    public void printInfo(){
        System.out.println("姓名：" + name);
        System.out.println("年龄：" + age);
        System.out.println("性别：" + gender);
    }

}

Student.java

package com.m.homework13;

public class Student extends Person {
    private String stuId; //学号

    public Student(String name, int age, char gender, String stuId) {
        super(name, age, gender);
        this.stuId = stuId;
    }

    public String getStuId() {
        return stuId;
    }

    public void setStuId(String stuId) {
        this.stuId = stuId;
    }

    public void study(){
        System.out.println("我承诺，我会好好学习");
    }

    @Override
    public void play() {
        super.play();
        System.out.println("足球");
    }

    @Override
    public void printInfo() {
        System.out.println("学生的信息：");
        super.printInfo();
        System.out.println("学号：" + stuId);
    }
}

Teacher.java

package com.m.homework13;

public class Teacher extends Person{
    private int workAge; //工龄

    public Teacher(String name, int age, char gender, int workAge) {
        super(name, age, gender);
        this.workAge = workAge;
    }

    @Override
    public void printInfo() {
        System.out.println("老师的信息：");
        super.printInfo();
        System.out.println("工龄：" + workAge);
    }

    public void teach(){
        System.out.println("我承诺，我会认真教学");
    }

    @Override
    public void play() {
        super.play();
        System.out.println("象棋");
    }
}

Homework13.java

package com.m.homework13;

public class Homework13 {
    public static void main(String[] args) {
        Person[] persons = new Person[4];
        persons[0] = new Student("田所浩二", 24, '男', "114514");
        persons[1] = new Student("波奇酱", 18, '女', "1919" );
        persons[2] = new Teacher("我修院", 26, '男', 1);
        persons[3] = new Teacher("德川", 26, '男', 1);
        Homework13 homework13 = new Homework13();
        homework13.bubbleSort(persons);
        homework13.printResults(persons);

    }
    //自动转型的方法
    public void test(Person p){
        if(p instanceof Student){
            ((Student) p).study();
        }else if(p instanceof Teacher){
            ((Teacher) p).teach();
        }
    }
    //冒泡排序方法
    public void bubbleSort(Person[] persons){
        //冒泡排序按年龄排序
        Person tmp = null; //冒泡排序用的临时引用
        //从i到倒数第二个元素，方便给最后一个元素交换
        for(int i = 0; i < persons.length - 1 ; i++){
            for(int j = 0; j < persons.length - i - 1; j++){
                if(persons[j].getAge() > persons[j+1].getAge()){
                    tmp = persons[i];
                    persons[i] = persons[j];
                    persons[j] = tmp;
                }
            }
        }
    }
    //打印Person数组信息
    public void printResults(Person[] persons){
        //打印数组，使用向下转型
        for(int i = 0; i < persons.length; i++){
            System.out.println("-------------------------");
            if(persons[i] instanceof Student){
                ((Student)persons[i]).printInfo();
                ((Student)persons[i]).study();
                test(persons[i]);
            }
            if(persons[i] instanceof Teacher){
                ((Teacher)persons[i]).printInfo();
                ((Teacher)persons[i]).teach();
                ((Teacher)persons[i]).play();
            }
        }
    }

}

运行结果：
-------------------------
学生的信息：
姓名：波奇酱
年龄：18
性别：女
学号：1919
我承诺，我会好好学习
我承诺，我会好好学习
-------------------------
学生的信息：
姓名：田所浩二
年龄：24
性别：男
学号：114514
我承诺，我会好好学习
我承诺，我会好好学习
-------------------------
老师的信息：
姓名：我修院
年龄：26
性别：男
工龄：1
我承诺，我会认真教学
我修院爱玩象棋
-------------------------
老师的信息：
姓名：德川
年龄：26
性别：男
工龄：1
我承诺，我会认真教学
德川爱玩象棋