public class Try5
{
    public void run(byte k)
    {
        byte  y=1,i=1;
        System.out.print(k+"!=");
        for (i=1;i<=k;i++)
        {
            try
            {
                if(y>Byte.MAX_VALUE/i)            //Integer類的常量
                   throw new Exception("overflow");  //溢出時(shí)拋出異常
                else
                   y = (byte) (y * i);
            }
            catch(Exception e)
            {
                System.out.println("exception: "+e.getMessage());
                e.printStackTrace();                 //顯示異常信息
                System.exit(0);
            }
        }
        System.out.println(y);
    }
    public static void main (String args[])
    {
        Try5 a = new Try5();
        for (byte i=1;i<10;i++)
            a.run(i);
    }
}