不知道错在什么地方了,在线等

Question

__________________
                        |  Instrument    |
                        | void  play()   |
                        | String what()  |
                        | void adjust()  |
                        |________________|      
                              /|\(左面是箭头)
              _________________|_______________
              |                |              |
              |                |              |
       _______|________    ____|__________ ___|____________
       |     Wind     |    | Percussion  | |  Stringed    |
       | void play()  |    |void  play() | | void  play() |        
       | String what()|    |String what()| | String what()|
       | void adjust()|    |void adjust()| | void adjust()|
       |______________|    |_____________| |______________|
              /|\（左面是箭头）  
               |—————-|
               |           |
       ________|______   __|_______________
       |   Woodwind  |   |  Bress         |
       |void play()  |   |  void play()   |    
       |String what()|   |  void adjust() |    
       |_____________|   |________________|
这个图比上面的图清楚一些

Answer 1

__________________
                        |  Instrument    |
                        | void  play()   |
                        | String what()  |
                        | void adjust()  |
                        |________________|      
                              /|\(左面是箭头)
              _________________|_______________
              |                |              |
              |                |              |
       _______|________    ____|__________ ___|____________
       |     Wind     |    | Percussion  | |  Stringed    |
       | void play()  |    |void  play() | | void  play() |        
       | String what()|    |String what()| | String what()|
       | void adjust()|    |void adjust()| | void adjust()|
       |______________|    |_____________| |______________|
              /|\（左面是箭头）  
                  |—————-|
               |           |
       ________|______   __|_______________
       |   Woodwind  |   |  Bress         |
       |void play()  |   |  void play()   |    
       |String what()|   |  void adjust() |    
       |_____________|   |________________|

Answer 2

请您这样定义类好吗！
public class Instrument{}
另外，给你个建议，如果您每一个class 都放在一个.java文件里面的话
请您定义为public行吗！具体细节请察看 [think-in-java]谢谢！祝你好运！

Answer 3

这个程序的例子在thinking in java 里面有哦。建议参考一下tij。

Answer 4

注意，应该是：
public class Instrument{
       void play()
       {
          System.out.println("Instrument-play");
       }
       String what()
       { 
          System.out.println("Instrument-what");
       }
       void adjust()
       {
          System.out.println("Instrument-adjust");
       }
    }

Answer 5

是thinking in java中的例子吧，这是一颗继承树