抽象，接口

分析：从具体到抽象

编程：从抽象到具体

题目：教练和运动员案例

乒乓球运动员和篮球运动员

乒乓球教练和篮球教练

为了出国交流，和乒乓球相关的人员都需要学习英语。

请用所学知识，分析：这个案例中有哪些抽象类，哪些接口，哪些具体类。

人：吃饭();//抽象方法

        睡觉(){ }//具体方法

//定义一个说英语的接口
interface SpeakEnglish{
	//说英语
	public abstract void speak();
}

//定义人的抽象类
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("人都是要睡觉的");
	}
	//吃饭
	public abstract void eat();		
}

//定义运动员抽象类
abstract class Sporter extends Person{
	public Sporter() {}
	
	public Sporter(String name,int age){
		super(name,age);
	}
	
	//学习
	public abstract void eat();
}

//定义教练抽象类
abstract class Coach extends Person{
	public Coach() {}
	
	public Coach(String name,int age){
		super(name,age);
	}
	
	//教
	public abstract void teach();
}

//定义乒乓球运动员具体类
class PingPangPlayer extends Sporter implements SpeakEnglish{
	public PingPangPlayer() {}
	
	public PingPangPlayer(String name,int age){
		super(name,age);
	}
	
	//吃
	public void eat(){
		System.out.println("吃大白菜，喝小米粥");
	}
	//学习
	public void study(){
		System.out.println("乒乓球运动员学习如何发球和接球");
	}
	//说英语
	public void speak(){
		System.out.println("乒乓球运动员说英语");
	}
}

//定义篮球运动员具体类
class BasketballPlayer extends Sporter {
	public BasketballPlayer() {}
	
	public BasketballPlayer(String name,int age){
		super(name,age);
	}
	
	//吃
	public void eat(){
		System.out.println("吃牛肉，喝牛奶");
	}
	//学习
	public void study(){
		System.out.println("篮球运动员学习如何运球和投篮");
	}
}

//定义乒乓球教练具体类
class PingPangCoach extends Coach implements SpeakEnglish{
	public PingPangCoach() {}
	
	public PingPangCoach(String name,int age){
		super(name,age);
	}
	
	//吃
	public void eat(){
		System.out.println("乒乓球教练吃大白菜，喝大米粥");
	}
	//教
	public void teach(){
		System.out.println("乒乓球教练教如何发球和接球");
	}
	//说英语
	public void speak(){
		System.out.println("乒乓球教练说英语");
	}
}

//定义篮球教练具体类
class BasketballCoach extends Coach {
	public BasketballCoach() {}
	
	public BasketballCoach(String name,int age){
		super(name,age);
	}
	
	//吃
	public void eat(){
		System.out.println("篮球教练吃羊肉，喝牛奶");
	}
	//教
	public void teach(){
		System.out.println("篮球教练教如何运球和投篮");
	}
}
class InterfaceDemo{
	public static void main(String[] args){
		//测试运动员
		//乒乓球运动员
		PingPangPlayer ppp = new PingPangPlayer();
		ppp.setName("张继科");
		ppp.setAge(28);
		System.out.println(ppp.getName()+"---"+ppp.getAge());
		ppp.eat();
		ppp.sleep();
		ppp.study();
		ppp.speak();
		System.out.println("-----------------");
		
		//通过带参构造函数
		PingPangPlayer ppp1 = new PingPangPlayer("马龙",26);
		System.out.println(ppp1.getName()+"---"+ppp1.getAge());
		ppp1.eat();
		ppp1.sleep();
		ppp1.study();
		ppp1.speak();
		System.out.println("-----------------");
	}
}