public void AddBookCopy(BookCopy copy) { if (!copies.Contains(copy)) { copies.Add(copy); } }
public void ReturnBook(BookCopy bookCopy) { takenBooks.Remove(bookCopy); bookCopy.ReturnCopy(); }
public void TakeBookCopy(BookCopy bookCopy) { takenBooks.Add(bookCopy); bookCopy.TakeCopy(); }
public void RemoveBookCopy(BookCopy copy) { copies.Remove(copy); }