Question 13: Consider the Java code segment given below. From the fol…

1class BookList {
2    private class Book implements Printable {
3        private String title;
4        public Book(String t) {
5            title = t;
6        }
7        public void print() {
8            System.out.println("Book: " + title);
9        }
10    }
11
12    private class BookIterator implements Iterable {
13        private int idx;
14        public BookIterator() {
15            idx = -1;
16        }
17        public boolean has_next() {
18            return idx < list.length - 1;
19        }
20        public Printable get_next() {
21            idx++;
22            return list[idx];
23        }
24
25    }
26
27    public Iterable getIterator() {
28        return new BookIterator();
29    }
30
31    private Book[] list = {
32        new Book("Java Basics"), new Book("Data Structures"),
33        new Book("Design Patterns"), new Book("Algorithms"),
34        new Book("Software Engineering")
35    };
36}
37
38public class TestBooks {
39    public static void main(String[] args) {
40        BookList myBooks = new BookList();
41        Iterable it = myBooks.getIterator();
42        while(it.has_next()) {
43            it.get_next().print();
44        }
45    }
46}