接口2.0

package com_black.jiekou.Demo01;

public interface English {
    public abstract void speak();
}

package com_black.jiekou.Demo01;

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;
    }
    public abstract void eat();
}

package com_black.jiekou.Demo01;

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

    public Player(String name, int age) {
        super(name, age);
    }
    public abstract void study();
}

package com_black.jiekou.Demo01;

public class BasketballPlayer extends Player{
    public BasketballPlayer() {
    }

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

    @Override
    public void study() {
        System.out.println("篮球运动员学习唱跳rap打篮球");
    }

    @Override
    public void eat() {
        System.out.println("篮球运动员吃牛肉，喝牛奶");
    }
}

package com_black.jiekou.Demo01;

public class PingpangPlayer extends Player implements English{
    public PingpangPlayer() {
    }

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

    @Override
    public void study() {
        System.out.println("乒乓球运动员学习如何接球和发球");
    }

    @Override
    public void eat() {
        System.out.println("乒乓球运动员吃大白菜喝小米粥");
    }

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

package com_black.jiekou.Demo01;

public class PersonDemo {
    public static void main(String[] args) {
        PingpongPlayer ppp=new PingpongPlayer();
        ppp.setAge(18);
        ppp.setName("小白");
        System.out.println(ppp.getName()+","+ppp.getAge());
        ppp.eat();
        ppp.study();
        ppp.speak();
        System.out.println("--------------");

        BasketballPlayer bbb=new BasketballPlayer();
        bbb.setAge(20);
        bbb.setName("小铭");
        System.out.println(bbb.getAge()+","+bbb.getName());
        bbb.eat();
        bbb.study();
    }
}