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