Facade

Facade patterns hide the complexities of the system and provide an interface to the client which the client can access accross the system.

Example

Given a 'complex system' that consists of an interface Shape.java and its children, Square.java, Circle.java and Triangle.java. A facade could take the form of a ShapeMaker.java which creates an instance of each of these shaped in its constructor and has methods to draw each of them. A Demo.java class can then just call the shape maker, and does not not to interact with the complex system.