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