[fadeh]

At page 135 it's stated that the main difference between the two is that: "[...] By subclassing the PizzaStore class, you decide what concrete products go into making the pizza that orderPizza() returns. Compare that with SimpleFactory, which gives you a way to encapsulate object creation, but doesn't give you the flexibility of the Factory Method because there is no way to vary the products you're creating".
I found that this isn't true at all. In fact you can have something like that (it's c# but almost the same):

    public class PizzaStore
    {
        IPizzaFactory Factory;
        public PizzaStore(IPizzaFactory factory)
        {
            this.Factory = factory;
        }

        public Pizza orderPizza(string type)
        {
            Pizza pizza = Factory.createPizza(type);
        }
    }

And you can have the very same pros from a factory method pattern. You can vary the products by varying the concrete PizzaFactory you supply. So what's the point? Am I missing something?

Thank you