package iterator;

/**
 * Iterator Design Pattern — Runnable Demo
 * Run: javac iterator/*.java -d out/iterator && java -cp out/iterator iterator.Main
 * Article: https://ankurm.com/iterator-design-pattern-java/
 */
public class Main {
    public static void main(String[] args) {
        System.out.println("=== Iterator Design Pattern Demo ===\n");

        BookShelf shelf = new BookShelf();
        shelf.addBook(new Book("Clean Code",              "Robert Martin", 2008));
        shelf.addBook(new Book("The Pragmatic Programmer","Andrew Hunt",   1999));
        shelf.addBook(new Book("Effective Java",          "Joshua Bloch",  2001));
        shelf.addBook(new Book("Design Patterns",         "Gang of Four",  1994));
        shelf.addBook(new Book("Refactoring",             "Martin Fowler", 2018));
        shelf.addBook(new Book("Working Effectively with Legacy Code", "Michael Feathers", 2004));

        System.out.println("-- All books (forward iterator) --");
        BookIterator it = shelf.iterator();
        while (it.hasNext()) {
            System.out.println("  " + it.next());
        }

        System.out.println("\n-- Books from the 2000s --");
        BookIterator it2000s = shelf.iteratorByDecade(2000);
        while (it2000s.hasNext()) {
            System.out.println("  " + it2000s.next());
        }

        System.out.println("\n-- JDK Iterable: same pattern, different vocabulary --");
        System.out.println("  java.util.Iterator is our BookIterator; for-each uses it under the hood");

        System.out.println("\n=== Demo complete ===");
    }
}