下面的异常程序哪里出错？

Question

class  FuShuException   extends   RuntimeException

{

FuShuException (String  msg)

{

super(msg);

}

}

class  Demo

{

int  div(int a, int  b)throws   Exception//throws  ArithmeticException

{

if(b<0)

throw  new   Exception("出现了除数为负数了");

if(b==0)

throw  new   ArithmeticException("被零除啦");

return  a/b;

}

}

class   ExceptionDemo4

{

public   static  void  main(String[]  args)

{

Demo  d=new  Demo();

int  x=d.div(4,-9);

System.out.println("x="+x);

System.out.println("over");

}

}

  

Answer 1

去RuntimeException副类找找原因

Answer 2

你抛出了异常，需要catch一下，或者用throws声明啊