如何创建一个可以使用try.....catch.......捕获的异常

代码很简单，大家一看基本上就能明白（有一定的java基础，熟悉try......catch.....finally的使用方法）

 1 package com.nokia.test1;
 2 
 3 
 4 public class test {
 5     
 6     
 7     public static void main(String[] args) {
 8         
 9         NumberTest n = new NumberTest();        
10         
11         //捕获异常  
12         try{  
13             System.out.println("商="+n.div(1,0));  
14             
15         }catch(customException1 yc){  
16             System.out.println(yc.getMessage());  
17             yc.printStackTrace();  
18         }  
19         catch(customException2 yx)  
20         {  
21             System.out.println(yx.getMessage());  
22             yx.printStackTrace();  
23         }  
24         catch(Exception y)  
25         {  
26             System.out.println(y.getMessage());  
27             y.printStackTrace();  
28         }  
29       
30         finally{ System.out.println("finally!");} ////finally不管发没发生异常都会被执行    
31             
32         
33                 
34     }
35 
36 }
37 
38 class customException1 extends Exception{
39 
40     public customException1(String msg) {
41         super(msg);
42         // TODO Auto-generated constructor stub
43     }    
44 }
45 
46 
47 class customException2 extends Exception{
48 
49     public customException2(String message) {
50         super(message);
51         // TODO Auto-generated constructor stub
52     }
53 }
54 
55 
56 class NumberTest{
57     
58     public int div(int x, int y) throws customException1, customException2 {
59         
60         if (y<0) {
61             
62             throw new customException1("您输入的是"+y+",规定除数不能为负数!"); //抛出异常
63         }
64         
65          if(y==0)  
66             {  
67                 throw new customException2("您输入的是"+y+",除数不能为0!");  
68             }  
69         
70         return x / y;
71     }
72     
73     
74 }

如有什么好的建议，请畅所欲言！！！！！

参考链接：http://blog.csdn.net/stellaah/article/details/6738424