Exception 만들기 사용 예

// Exception 만들기
public class CartBean implements SessionBean {
    public void removeBook(String title) throws BookException {
        boolean result = contents.removeElement(title);
        if (result==false) {
            throw new BookException(title+" not id cart");
        }
        System.out.println("removeBook");
    }
}

public class BookException extends Exception {
    public BookException() {}
    public BookException(String msg) {
        super(msg);
    }
}