Suppose we want to model several different physical bookshelves full of books. W
ID: 3902842 • Letter: S
Question
Suppose we want to model several different physical bookshelves full of books. Which of the following would represent the best structure in Java? a Book class, where each book is an object, and a Shelf class, where each bookshelf is an object a Book class, where each book is an object, and a HashSet of Book objects, where each Set represents a bookshelf a Book class, where each object represents a book along with the details of the shelf it is in a Shelf class, where each object represents the bookshelf and all of its books
Explanation / Answer
a Book class, where each book is an object, and a Shelf class, where each bookshelf is an object a Book class: Here each bookshelf is an object of the Book class. But each bookshelf can contain multiple books and hence each bookshelf cannot be an object of a single book class. So this is a bad model
where each book is an object, and a HashSet of Book objects, where each Set represents a bookshelf : Here each book is a object and a hashset of these objects represent a shelf. However, the hashset doesnot allow multiple similar entries. However a shelf can contain multiple copies of the same book. Hence it is a bad model.
a Book class, where each object represents a book along with the details of the shelf it is in a Shelf class, where each object represents the bookshelf and all of its books : Here the shelf class represents the shelf along with all the books that a shelf has and the individual book class also has the details of the shelf on which it is present. It is the best model to represent the data