Implementation problem

[jcarosella10]

Hello again, sorry to post again so soon

I'm developing a class hierarchy of books, and my implementation skills are not quite adequate.
take a look

//Book interface
public interface Book
{
    public int numPages();
    public String bookTitle();
    public String authorName();
    public boolean isHardCover();
    public boolean isOpen();
    public void open();
    public void close();
}
//novel class
public class Novel implements Book
{
    private int pages;
    private String title;
    private String authorfirst;
    private String authorlast;
    private boolean hardCover;
    private boolean Open;
    public Novel(String booktitle, int numpages, String lastname, String firstname, boolean _hardCover)
    {
        pages = numpages;
        title = booktitle;
        authorlast = lastname;
        authorfirst = firstname;
        hardCover = _hardCover;
        Open = false;
    }
    public int numPages()
    {
        return pages;
    }
    public String bookTitle()
    {
        return title;
    }
    public String authorName()
    {
        return authorlast + ", " + authorfirst;
    }
    public boolean isHardCover()
    {
        return hardCover;
    }
    public void isOpen()
    {
        return Open;
    }
    public void open()
    {
        isOpen = true;
    }
    public void close()
    {
        isOpen = false;
    }
}

it says that novel doesn't overwrite the abstract classes in book, am i overlooking something?

[eRaaaa]

 public void isOpen()
    {
        return Open;
    }
    public void open()
    {
        isOpen = true;
    }
    public void close()
    {
        isOpen = false;
    }

there is no variable isOpen! (do you mean Open? :D) and if a method is declared as void, you can`t return something :D

[jcarosella10]

wow. i need to drink some coffee can't believe i missed that. The variable Open was isOpen and i missed those. Also the declaration is just plain dumb on my part. thank you very much!

[Tolls]

Just a note, but there's no need at all (and it's generally frowned upon) to declare the methods in an interface as 'public'.
They're all public by default.

[jcarosella10]

Oh i know tolls, its just that this is a class and she takes off if we don't use the public. The programs i do outside of homework i dont use the public keyword

[Tolls]

You're kidding?
Blimey.