Design Patterns Java™ Workbook

Iterator (Chapter 28)

SOLUTION 28.1

A working program is: package com.oozinoz.applications; import com.oozinoz.fireworks.*; public class ShowFireworkList { public static void main(String[] args) { FireworkList flist = Promo.getPromotionalFireworks(); FireworkList.Itr i = flist.iterator(); while (i.hasNext()) { Firework f = i.next(); System.out.println( f.getName() + ", $" + f.getPrice() + ", " + f.getType()); } } }

SOLUTION 28.2

As Chapter 16, Factory Method, describes, iterators provide a classic example of the FACTORY METHOD pattern. A client that wants an iterator for an instance of a ProcessComponent knows when to create the iterator, but the receiving class knows which class to instantiate.

SOLUTION 28.3

You need to change the next() code ...