继承—Music

1 public class Instrument {
2
3     public void play(){
4         System.out.println("弹奏乐器");
5     }

 1 public class Wind extends Instrument {
 2
 3     public void play(){
 4         System.out.println("弹奏Wind");
 5     }
 6
 7     public void play2(){
 8         System.out.println("调用Wind的play2");
 9     }
10
11 }

 1 public class Brass extends Instrument {
 2
 3     public void play(){
 4         System.out.println("弹奏Brass");
 5     }
 6     public void play2(){
 7         System.out.println("调用Brass的play2");
 8     }
 9
10 }

 1 public class Music {
 2     public static void tune (Instrument i){
 3         i.play();
 4     }
 5
 6
 7     public static void main(String[] args) {
 8
 9         Wind w=new Wind();
10         tune(w);
11         Brass b=new Brass();
12         tune(b);
13         b.play2();
14
15
16     }
17
18 }

结果：