Java的类与接口实例

﹏ヽ暗。殇╰゛Y 2022-05-30 09:15 200阅读 0赞

//接口不能实例化

//接口的子类可以是具体类，但是要重写接口中的所有抽象方法。

package exercise;  
//定义一个说英语的接口  
interface SpeakEnglish\{  
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.age=age;  
this.name=name;  
\}  
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 Athlete extends Person\{  
public Athlete()\{\}  
public Athlete(String name,int age)\{  
super(name,age);  
    \}  
  
//学习  
public abstract void study();  
\}  
//定义运动员抽象类  
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 Athlete implements SpeakEnglish\{  
public PingPangPlayer()\{\}  
  
public PingPangPlayer(String name,int age)\{  
super(name,age);  
\}  
//吃  
public void eat()\{  
System.out.println("喝小米粥");  
\}  
//学习  
public void study()\{  
System.out.println("如何接发球");  
\}  
  
//说英语  
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 Athlete\{  
public BasketBallPlayer()\{\}  
  
public BasketBallPlayer(String name,int age)\{  
super(name,age);  
\}  
//吃  
public void eat()\{  
System.out.println("喝牛奶");  
\}  
    //学习  
public void study() \{  
System.out.println("投篮");  
\}  
\}  
class PingPangCoach extends Coach implements SpeakEnglish\{  
public PingPangCoach()\{\}  
  
public PingPangCoach(String name,int age)\{  
super(name,age);  
\}  
//吃  
public void eat()\{  
System.out.println("喝小米粥");  
\}  
//学习  
public void teach()\{  
System.out.println("教如何接发球");  
\}  
  
//说英语  
public void speak()\{  
System.out.println("乒乓球运动员说英语");  
\}  
  
  
  
\}  
  
  
class BasketBallCoach extends Coach\{  
public BasketBallCoach()\{\}  
  
public BasketBallCoach(String name,int age)\{  
super(name,age);  
\}  
//吃  
public void eat()\{  
System.out.println("喝牛奶");  
\}  
public void teach()\{  
System.out.println("教如何投篮");  
\}  
\}  
  
  
public class InterfaceDemo \{  
public static void main(String\[\] args)\{  
PingPangPlayer p = new PingPangPlayer();  
p.setName("郭新兴");  
p.setAge(25);  
System.out.println(p.getName()+"----"+p.getAge());  
p.eat();  
p.sleep();  
p.study();  
p.speak();  
System.out.println("-------------");  
  
  
BasketBallPlayer bbp = new BasketBallPlayer();  
    bbp.setName("库里");  
    bbp.setAge(25);  
System.out.println(bbp.getName()+"----"+bbp.getAge());  
    bbp.eat();  
    bbp.sleep();  
    bbp.study();  
System.out.println("-------------");  
  
  
PingPangCoach pc = new PingPangCoach();  
pc.setName("马龙");  
pc.setAge(45);  
System.out.println(pc.getName()+"----"+pc.getAge());  
pc.eat();  
pc.sleep();  
pc.teach();  
pc.speak();  
System.out.println("-------------");  
  
  
BasketBallCoach bbc = new BasketBallCoach();  
bbc.setName("科比");  
bbc.setAge(55);  
System.out.println(bbc.getName()+"----"+bbc.getAge());  
bbc.eat();  
bbc.teach();  
bbc.sleep();  
System.out.println("-------------");  
\}

运行结果：

![70][]

[70]: /images/20220530/3210022dcd644b4a87a2234912b6946d.png