Class BookIterator

IteratorDesignPattern/BookIterator.java:5–26

import java.util.List;

public class BookIterator implements Iterator{
    private List<Book> books;
    private int index = 0;

    public BookIterator(List<Book> books){
        this.books = books;
    }


    @Override
    public boolean hasNext() {
        return index < books.size();
    }

    @Override
    public Object next() {
        if (this.hasNext()){
            return books.get(index++);
        }
        return null;
    }
}