使用Java如何实现异常自定义

 /*下面做了归纳总结,欢迎批评指正*/ 
 /*自定义异常*/ 
 class ChushulingException extends Exception 
 { 
   public ChushulingException(String msg) 
   { 
     super(msg); 
   } 
 }  
 class ChushufuException extends Exception 
 { 
   public ChushufuException(String msg) 
   { 
     super(msg); 
   } 
 } 
 /*自定义异常 End*/ 
 class Numbertest  
 { 
   public int shang(int x,int y) throws ChushulingException,ChushufuException 
   { 
     if(y<0) 
     { 
       throw new ChushufuException("您输入的是"+y+",规定除数不能为负数!");//抛出异常 
     } 
     if(y==0) 
     { 
       throw new ChushulingException("您输入的是"+y+",除数不能为0!"); 
     } 
     int m=x/y; 
     return m; 
   } 
 } 
 class Rt001 
 { 
   public static void main(String[]args) 
   { 
     Numbertest n=new Numbertest(); 
     //捕获异常 
     try 
     { 
       System.out.println("商="+n.shang(1,-3)); 
     } 
     catch(ChushulingException yc) 
     { 
       System.out.println(yc.getMessage()); 
       yc.printStackTrace(); 
     } 
     catch(ChushufuException 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  
   } 
 } 
 /* 
 [总结] 
 1.自定义异常: 
 class 异常类名 extends Exception 
 { 
   public 异常类名(String msg) 
   { 
     super(msg); 
   } 
 } 
 2.标识可能抛出的异常: 
 throws 异常类名1,异常类名2 
 3.捕获异常: 
 try{} 
 catch(异常类名 y){} 
 catch(异常类名 y){} 
 4.方法解释 
 getMessage() //输出异常的信息 
 printStackTrace() //输出导致异常更为详细的信息 
 */