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The Book class should have appropriate constructors, getters, and setters. The BookShelf class should have methods to add a book, remove a book, get a book based on index, and return an iterator for its books. (Hint: you might want to use a List in your Bookshelf - private List<Book> books;)
Test Your Implementation
Create a Main class that will create a BookShelf, add some Book instances to it, and then use a BookIterator to iterate through the books and print out their details.
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