接口和继承

package com.imooc;
interface SpeakEnglish{
    public abstract void speakEnglish();
}
abstract class Person{
    String name;
    int 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 Person(){}
    public Person(String name, int age){
        this.name = name;
        this.age = age;
    }
    
    public abstract void eat();
    public void sleep(){
        System.out.println("睡觉吧");
    }
}
abstract class Player extends Person{
    public Player(){}
    public Player(String name, int age){
        super(name, age);
    }
    public abstract void study();
}
abstract class Coach extends Person{
    public Coach(){}
    public Coach(String name, int age){
        this.name = name;
        this.age = age;
    }
    public abstract void teach();
}
class PingPangPlayer extends Player implements SpeakEnglish{
    public PingPangPlayer(){}
    public PingPangPlayer(String name, int age){
        super(name, age);
    }
    public void eat(){
        System.out.println("乒乓球运动员吃饭");
    }
    public void study(){
        System.out.println("乒乓球运动员学习");
    }
    public void speakEnglish(){
        System.out.println("乒乓球运动员说英语");
    }
}
class BasketPlayer extends Player{
    public BasketPlayer(){}
    public BasketPlayer(String name, int age){
        super(name, age);
    }
    public void eat(){
        System.out.println("篮球运动员吃饭");
    }
    public void study(){
        System.out.println("篮球运动员学习");
    }
}
class BasketCoach extends Coach{
    public BasketCoach(){}
    public BasketCoach(String name, int age){
        super(name, age);
    }
    public void eat(){
        System.out.println("篮球教练吃饭");
    }
    public void teach(){
        System.out.println("篮球教练教学");
    }
}
class PingPangCoach extends Coach implements SpeakEnglish{
    public PingPangCoach(){}
    public PingPangCoach(String name, int age){
        super(name, age);
    }
    public void eat(){
        System.out.println("乒乓球教练吃饭");
    }
    public void teach(){
        System.out.println("乒乓球教练上课");
    }
    public void speakEnglish(){
        System.out.println("乒乓球教练说英语");
    }
}

public class InterfaceDemo5 {
    public static void main(String[] args){
        PingPangPlayer ppp = new PingPangPlayer();
        ppp.setName("林青霞");
        ppp.setAge(27);
        System.out.println(ppp.getName()+"---"+ppp.getAge());
        ppp.eat();
        ppp.sleep();
        ppp.study();
        PingPangCoach ppc = new PingPangCoach("明明", 21);
        System.out.println(ppc.getName()+"---"+ppc.getAge());      
        ppc.eat();
        ppc.sleep();
        ppp.study();
        
        
        BasketPlayer bp = new BasketPlayer();
        bp.setName("明明");
        bp.setAge(21);
        System.out.println(bp.getName()+"---"+bp.getAge());
        bp.eat();
        bp.sleep();
        bp.study();
        
        BasketCoach bc = new BasketCoach("小明", 20);
        bc.eat();
        bc.sleep();
    }
    
}

接口和继承

/*
 *     类与类：
    继承关系，只能单继承，可以多层继承
    类与接口：
        实现关系，可以单实现，也可以多实现
    接口与接口：
        继承关系，可以单继承，也可以多继承
 * */
interface Father{
    public abstract void show();
}
interface Mother{
    public abstract void show2();
}
interface Sister extends Father, Mother{
    
}
class Son extends Object implements Father, Mother{
    public void show(){
        System.out.println("show son");
    }
    public void show2(){
        System.out.println("show son2");
    }
}
public class InterfaceDemo2 {
    public static void main(String[] args){
        
    }
}

 抽象类使用接口进行功能扩展

interface Jumpping{
    public abstract void jump();
}
abstract class Animal{
    private String name;
    private int age;
    public Animal(){}
    public Animal(String name, int age){
        this.name = name;
        this.age = age;
    }
    public void setName(String name){
        this.name = name;
    }
    public String getName(){
        return name;
    }
    public void setAge(int age){
        this.age = age;
    }
    public int getAge(){
        return age;
    }
    public void sleep(){
        System.out.println("睡觉啰");
    }
    public abstract void eat();
}
class Cat extends Animal{
    public Cat(){}
    public Cat(String name, int age){
        super(name, age);
    }
    public void eat(){
        System.out.println("猫吃鱼");
    }
}
class JumpCat extends Cat implements Jumpping{
    public JumpCat(){}
    public JumpCat(String name, int age){
        super(name, age);
    }
    public void jump(){
        System.out.println("猫跳高");
    }
}
public class InterfaceDemo3 {
    public static void main(String[] args){
        JumpCat jp = new JumpCat();
        jp.setName("Tom");
        jp.setAge(3);
        System.out.println(jp.getName()+"------"+jp.getAge());
        jp.eat();
        jp.sleep();
        jp.jump();
    }
}

 运动员教练案例