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）

 package com.nokia.test1;

 public class test {

     public static void main(String[] args) {

         NumberTest n = new NumberTest();        

         //捕获异常
         try{
             System.out.println("商="+n.div(1,0));  

         }catch(customException1 yc){
             System.out.println(yc.getMessage());
             yc.printStackTrace();
         }
         catch(customException2 yx)
         {
             System.out.println(yx.getMessage());
             yx.printStackTrace();
         }
         catch(Exception y)
         {
             System.out.println(y.getMessage());
             y.printStackTrace();
         }  

         finally{ System.out.println("finally!");} ////finally不管发没发生异常都会被执行    

     }

 }

 class customException1 extends Exception{

     public customException1(String msg) {
         super(msg);
         // TODO Auto-generated constructor stub
     }
 }

 class customException2 extends Exception{

     public customException2(String message) {
         super(message);
         // TODO Auto-generated constructor stub
     }
 }

 class NumberTest{

     public int div(int x, int y) throws customException1, customException2 {

         if (y<0) {

             throw new customException1("您输入的是"+y+",规定除数不能为负数!"); //抛出异常
         }

          if(y==0)
             {
                 throw new customException2("您输入的是"+y+",除数不能为0!");
             }  

         return x / y;
     }

 }

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