JAVA 面向对象进阶 18 接口和抽象类的综合案例

1 编写带有接口和抽象类的标准 Javabean 类

乒乓球运动员：姓名，年龄，学打乒乓球，说英语
篮球运动员：姓名，年龄，学打篮球
乒乓球教练：姓名，年龄，教打乒乓球，说英语
篮球教练：姓名，年龄，教打篮球

1.1 分析 1 

1.2 分析 2 

1.3 父类  Person

package com.bjpowernode.test07;

//因为现在我不想让外界去直接创建人的对象
//因为直接创建顶层父类人的对象此时是没有意义的
//所以就把他写为抽象的。
public abstract class Person {
    private String name;
    private int age;

    public Person() {
    }

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

    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;
    }
}

1.4 子类  运动员、教练

别忘了生成构造函数

package com.bjpowernode.test07;

public abstract class Coach extends Person {
    public Coach() {
    }

    public Coach(String name, int age) {
        super(name, age);
    }

    public abstract void teach();
}

package com.bjpowernode.test07;

public abstract class Sporter extends Person {
    public Sporter() {
    }

    public Sporter(String name, int age) {
        super(name, age);
    }

    public abstract void stduy();
}

1.5 接口

方法可以写成抽象方法

package com.bjpowernode.test07;

public interface Engilsh {
    public abstract void sppeakEnglish();   //抽象方法，不需要接口也是抽象的
}

1.6 子类 乒乓球运动员.....

别忘了生成构造函数

package com.bjpowernode.test07;

import com.bjpowernode.op_extends.Demo05.Employee;

public class PingPangSporter extends Sporter implements Engilsh {
    public PingPangSporter() {
    }

    public PingPangSporter(String name, int age) {
        super(name, age);
    }

    @Override
    public void stduy() {
        System.out.println("乒乓球运动员在学习如何打乒乓球");
    }

    @Override
    public void sppeakEnglish() {
        System.out.println("乒乓球运动员在说英语");
    }
}

package com.bjpowernode.test07;

public class BasketballSporter extends Sporter {
    public BasketballSporter() {
    }

    public BasketballSporter(String name, int age) {
        super(name, age);
    }

    @Override
    public void stduy() {
        System.out.println("篮球运动员在学习如何打篮球");
    }
}

package com.bjpowernode.test07;

public class PingPangCoach extends Coach implements Engilsh {
    public PingPangCoach() {
    }

    public PingPangCoach(String name, int age) {
        super(name, age);
    }

    @Override
    public void teach() {
        System.out.println("乒乓球教练正在教如何打乒乓球");
    }

    @Override
    public void sppeakEnglish() {
        System.out.println("乒乓球教练在说英语");
    }
}

package com.bjpowernode.test07;

public class BasketballCoach extends Coach{
    public BasketballCoach() {
    }

    public BasketballCoach(String name, int age) {
        super(name, age);
    }

    @Override
    public void teach() {
        System.out.println("篮球教练正在教如何打篮球");
    }
}

1.7 测试类

package com.bjpowernode.test07;

public class Test {
    public static void main(String[] args) {
        PingPangSporter pps = new PingPangSporter("孙颖莎", 25);
        System.out.println(pps.getName() + ", " + pps.getAge());
        pps.stduy();
        pps.sppeakEnglish();
    }
}

运行结果：

参考链接：

面向对象进阶-18-接口和抽象类的综合案例_哔哩哔哩_bilibili