C-7 运动员和教练案例

题目：

    乒乓球运动员，篮球运动员。乒乓球教练，篮球教练。
    为了出国交流，跟乒乓球相关的人员都需要学习英语。

分析：

实现：

/*
教师版
*/
interface SpeakEnglish{
    public abstract void speak();
}
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;
    }
    //睡觉
    public void sleep(){
        System.out.println("睡觉");
    }
    //吃饭
    public abstract void eat();
}

abstract class Player extends Person{
    public Player(){}
    public Player(String name,int age){
        super(name,age);
    }
    
    //学习
    public abstract void study();
}

abstract class Coach extends Person{
    public Coach(){}
    public Coach(String name,int age){
        super(name,age);
    }
    
    //学习
    public abstract void teach();
}
//乒乓球运动员具体类
class PingPangPlayer extends Player implements SpeakEnglish{
    public PingPangPlayer(){}
    public PingPangPlayer(String name, int age){
        super(name,age);
    }
    
    //吃饭
    public void eat(){
        System.out.println("乒乓球运动员吃菜饭");
    }
    //学习
    public void study(){
        System.out.println("乒乓球运动员学发球");
    }
    //学英语
    public void speak(){
        System.out.println("乒乓球运动员说英语");
    }
}
//篮球运动员具体类
class BasketballPlayer extends Player{
    public BasketballPlayer(){}
    public BasketballPlayer(String name, int age){
        super(name,age);
    }
    //吃饭
    public void eat(){
        System.out.println("篮球运动员吃牛肉");
    }
    //学习
    public void study(){
        System.out.println("篮球运动员学投篮");
    }
    
}
//乒乓球教练具体类
class PingPangCoach extends Coach implements SpeakEnglish{
    public PingPangCoach(){}
    public PingPangCoach(String name, int age){
        super(name,age);
    }
    
    //吃饭
    public void eat(){
        System.out.println("乒乓球教练吃菜饭");
    }
    //学习
    public void teach(){
        System.out.println("乒乓球教练教发球");
    }
    //学英语
    public void speak(){
        System.out.println("乒乓球教练说英语");
    }
}

//篮球教练具体类
class BasketballCoach extends Coach{
    public BasketballCoach(){}
    public BasketballCoach(String name, int age){
        super(name,age);
    }
    //吃饭
    public void eat(){
        System.out.println("篮球教练吃牛肉");
    }
    //学习
    public void teach(){
        System.out.println("篮球教练教投篮");
    }
    
}

//测试
class SportDemo2{
    public static void main(String[] args){
    
        //测试乒乓球运动员
        PingPangPlayer ppp = new PingPangPlayer("王浩",33);
        System.out.println("姓名："+ppp.getName()+",年龄："+ppp.getAge());
        ppp.sleep();
        ppp.eat();
        ppp.study();
        ppp.speak();
        System.out.println("-----------");
        
        //测试篮球运动员
        BasketballPlayer bp = new BasketballPlayer("姚明",36);
        System.out.println("姓名："+bp.getName()+",年龄："+bp.getAge());
        bp.sleep();
        bp.eat();
        bp.study();
        System.out.println("-----------");
        
        //测试乒乓球教练
        PingPangCoach ppc = new PingPangCoach("刘国梁",50);
        System.out.println("姓名："+ppc.getName()+",年龄："+ppc.getAge());
        ppc.sleep();
        ppc.eat();
        ppc.teach();
        ppc.speak();
        System.out.println("-----------");
        
        //测试篮球教练
        BasketballCoach bc = new BasketballCoach("安西",52);
        System.out.println("姓名："+bc.getName()+",年龄："+bc.getAge());
        bc.sleep();
        bc.eat();
        bc.teach();
        System.out.println("-----------");
    }
}

运行：

姓名：王浩,年龄：33
睡觉
乒乓球运动员吃菜饭
乒乓球运动员学发球
乒乓球运动员说英语
-----------
姓名：姚明,年龄：36
睡觉
篮球运动员吃牛肉
篮球运动员学投篮
-----------
姓名：刘国梁,年龄：50
睡觉
乒乓球教练吃菜饭
乒乓球教练教发球
乒乓球教练说英语
-----------
姓名：安西,年龄：52
睡觉
篮球教练吃牛肉
篮球教练教投篮
-----------