在catch块中throw new Exception的意义

throw new Exception(String, Exception)

throw new Exception(String)
throw是明确地抛出异常
throw new Exception("自定义抛出错误的原因").
public doube Division(double a,double b)
{
  if(b==0)
   {
     throw new Exception("除数不能为0");
   }
 return a/b;
}