SE450: The FACTORY METHOD Pattern [21/55]

Solution

1. Define a creator type that expresses the commonality of all creators.
   
2. Define a product type that expresses the commonality of all products.
   
3. Define a method, called the factory method, in the creator type.
   The factory method yields a product object.
   
4. Each concrete creator class implements the factory method so that it returns an object of a concrete product class.