接口和抽象类的综合案例

错误设计！

思路一：

思路二： 

//因为现在我不想让外界直接去创建人的对象
//因为直接创建顶层父类人的对象此时是没有意义的
//所以就把他写成抽象的
public 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;
    }
}

public abstract class Sporter extends Person{

    public Sporter() {
    }

    public Sporter(String name, int age) {
        super(name, age);
    }

    //因为篮球运动员和乒乓球运动员学习的不一样所以用抽象方法
    public abstract void study();//抽象方法所在的类必须是抽象类
}

public abstract class Coach extends Person{

    public Coach() {
    }

    public Coach(String name, int age) {
        super(name, age);
    }

    //同理 教的东西不一样所以是抽象的
    public abstract void teach();//抽象方法所在的类必须是抽象类
}

public interface English {
    public abstract void speakEnglish();
}

public class PingPangSporter extends Sporter implements English{

    public PingPangSporter() {
    }

    public PingPangSporter(String name, int age) {
        super(name, age);
    }

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

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

public class BasketballSporter extends Sporter{
    public BasketballSporter() {
    }

    public BasketballSporter(String name, int age) {
        super(name, age);
    }

    @Override
    public void study() {
        System.out.println("学打篮球两年半");
    }
}

public class PingPangCoach extends Coach implements English{

    public PingPangCoach() {
    }

    public PingPangCoach(String name, int age) {
        super(name, age);
    }

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

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

public class BasketballCoach extends Coach{
    public BasketballCoach() {
    }

    public BasketballCoach(String name, int age) {
        super(name, age);
    }

    @Override
    public void teach() {
        System.out.println("教打篮球一坤年");
    }
}

public class Test {
    public static void main(String[] args) {
        //创建运动员或者教练的对象
        BasketballSporter bs = new BasketballSporter("张三", 21);
        System.out.println(bs.getName() + "," + bs.getAge());
        bs.study();

        BasketballCoach bc = new BasketballCoach("李四", 30);
        System.out.println(bc.getName() + "," + bc.getAge());
        bc.teach();

        PingPangSporter pps = new PingPangSporter("王五",19);
        System.out.println(pps.getName() + "," + pps.getAge());
        pps.study();
        pps.speakEnglish();
    }
}

运行结果：