Abstract Factory is a creational design pattern that lets you produce families of related objects without specifying their concrete classes.

• You can be sure that the products you’re getting from a factory are compatible with each other.
• You avoid tight coupling between concrete products and client code.

• The code may become more complicated than it should be, since a lot of new interfaces and classes are introduced along with the pattern.

Here we consider creating UI Components for Windows and MacOS. GUI components gets created depending on the kind of the OS.

• We create GUIFactory interface that declares two components - Button and CheckBox
• Create interface for Button and its implementations (No. of interfaces - 1 , classes - 2).
• Same goes for CheckBox (No. of interfaces - 1, classes - 2).
• Create implementations for GUIFactory interface for the two OSes. Add concrete implementations done above.(No. of classes - 2)
• Create factory initialization code(GUI class) somewhere in the app. It should instantiate one of the concrete factory classes.(No. of classes - 1)
• Main Method acts as a client code here - that calls the GUI class, sends the OSType information and is unaware of the complexity involved.