24.2 接口案例

/*
* 篮球运动员和教练
乒乓球运动员和教练
现在篮球运动员和教练要出国访问,需要学习英语
请根据你所学的知识,分析出来哪些是类,哪些是抽象类,哪些是接口
*/

为何学英语是接口？

继承的特点是是单一继承，各个成员之间都有了对应关系。需要利用接口的多继承特点。

package day24_1接口_interface;

public class InterfaceTest {
    public static void main(String[] args) {
        BasketballPlayer bbp = new BasketballPlayer();
        bbp.name = "庆阳";
        bbp.age = 18;
        bbp.gender = "男";
        bbp.eat();
        bbp.study();
        bbp.speaking();
        System.out.println("-----------");

        PingpangCoach ppc = new PingpangCoach();
        ppc.age = 20;
        ppc.eat();
        ppc.teach();

    }
}

//人
class Person {
    String name;
    int age;
    String gender;

    public void eat() {
        System.out.println("吃饭");
    }

    public void sleep() {
        System.out.println("睡觉");
    }
}

//说英语
interface speak {
    public abstract void speaking();
}

//运动员
abstract class Player extends Person { //
    public abstract void study();
}

//教练
abstract class Coach extends Person {
    public abstract void teach();
}

//篮球运动员
class BasketballPlayer extends Player implements speak {

    @Override
    public void study() {
        System.out.println("学篮球");
    }

    @Override
    public void speaking() {
        System.out.println("说英语");
    }
}

//乒乓球运动员
class PingpangPlayer extends Player {

    @Override
    public void study() {
        System.out.println("学乒乓");
    }
}

//篮球教练
class BasketballCoach extends Coach implements speak {

    @Override
    public void teach() {
        System.out.println("教 篮球");
    }

    @Override
    public void speaking() {
        System.out.println("说英语");
    }
}

//乒乓球教练
class PingpangCoach extends Coach {

    @Override
    public void teach() {
        System.out.println("教 乒乓");
    }
}

输出如下