public Book searchISBNbook(int ISBN) throws Exception{
		Book ISBNmatching;

		if(getequalISBN(ISBN)==1)
		{
			ISBNmatching = print(ISBN);
			System.out.println("*******************************************************************");
			return ISBNmatching;
		}
		else{
			System.out.println("ġϴ ISBN  ʽϴ.");
			return null;
		}
	}