作业-继承

package T092201;

public class Instrument {
    public void play()
    {
        System.out.println("弹奏乐器！");
    }
}



package T092201;

public class Wind extends Instrument{
    public void play()
    {
        System.out.println("弹奏Wind!");
    }
    public void play2()
    {
        System.out.println("调用wind的play2");
    }
}



package T092201;

public class Brass extends Instrument {
    //复写play方法
    public void play()
    {
        System.out.println("弹奏brass!");
    }
    public void play2()
    {
        System.out.println("调用brass的play2！");
    }
}



package T092201;

public class Music {
    public static void tune(Instrument i)
    {
        i.play();
    }
    public static void main(String[] args)
    {
        Wind w=new Wind();
        Brass b=new Brass();
        tune(w);
        tune(b);
    }
}