继承类

package bbb;

public class Instrument {
    public void play(){
        System.out.println("弹奏乐器");
    }
}
class wind extends Instrument{
    public void play(){
        System.out.println("弹奏wind");
    }
    public void play2(){
        System.out.println("调用wind的play2");
    }
}
class Brass extends Instrument{
    public void play(){
        System.out.println("弹奏brass");
    }
    public void play2(){
        System.out.println("调用brass的play2");
    }
}

package bbb;

public class Music {
    public static void tune(Instrument i){
        i.play();
    }
    public static void main(String[] args){
        Instrument i=new Instrument();
            i.play();
            wind w=new wind();
            tune(w);
           
            w.play2();
            Brass b=new Brass();
            tune(b);
            
            b.play2();
            //Music m=new Music();
            //m.tune(b);
            //m.tune(w);
        }
}