Factory Method Pattern
The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclass.
Factory Methods helps us adhere to Dependency Inversion Principle by depending upon high-level abstractions instead of concrete classes, and designing to interface and not worry about concrete classes from high-level code.
Simple Factory
Simple Factory is a class that encapsulates creation of concrete classes.
Pizza-Factory Class Diagram
