继承1

 1 package com.hanqi.z1p1;
 2 
 3 public class Instrument {
 4 
 5     public void play()
 6     {
 7         System.out.println("弹奏乐器");
 8     }
 9     
10     
11     
12 }

 1 package com.hanqi.z1p1;
 2 
 3 public class Wind extends Instrument {
 4 
 5     public void play()
 6     {
 7         System.out.println("弹奏Wind");
 8     }
 9     
10     
11     public void play2()
12     {
13         System.out.println("调用Wind的play2");
14     }
15     
16 }

 1 package com.hanqi.z1p1;
 2 
 3 public class Brass extends Instrument{
 4 
 5     public void play()
 6     {
 7         System.out.println("弹奏Brass");
 8     }
 9     
10     public void play2()
11     {
12         System.out.println("调用Brass的play2");
13     }
14     
15     
16     
17 }

 1 package com.hanqi.z1p1;
 2 
 3 public class Music {
 4 
 5     
 6     public static void tune(Instrument i) 
 7     {
 8     i.play();    
 9     }
10     
11     
12     public static void main(String[] args) {
13         // TODO 自动生成的方法存根
14 
15         Wind w=new Wind();
16         tune(w);
17         Brass b =new Brass();
18         tune(b);
19         
20         
21         
22         
23         
24     }
25 
26 }