Can you explain the difference between the 'Abstract Factory' pattern and the 'Factory Method' pattern in object design?

The "Abstract Factory" and "Factory Method" patterns both relate to object creation but differ in their level of abstraction and code organization.

Factory Method is a method in a base class or interface that subclasses override to create specific objects. It allows delegating object creation to subclasses while maintaining a common interface.

Example: there is a base class Creator with a method createProduct(), which subclasses implement to create specific products.

Abstract Factory is an object (factory) that creates families of related objects without specifying their concrete classes. It provides an interface for creating multiple types of products that are designed to work together.

In other words, if the Factory Method is responsible for creating a single product, the Abstract Factory is responsible for creating a set of related products.

Example: a GUI factory that creates buttons and windows for different operating systems (Windows, Mac), ensuring compatibility between them.

In brief:

• Factory Method: one method that creates one type of product, implemented by subclasses.
• Abstract Factory: an interface with multiple methods for creating a family of products, implemented by concrete factories.