Chapter 18. The Façade Pattern

The Façade pattern is used to wrap a set of complex classes into a simpler enclosing interface. As your programs evolve and develop, they grow in complexity. In fact, for all the excitement about using design patterns, these patterns sometimes generate so many classes that it is difficult to understand the program’s flow. Furthermore, there may be a number of complicated subsystems, each of which has its own complex interface.

The Façade pattern allows you to simplify this complexity by providing a simplified interface to these subsystems. This simplification may in some cases reduce the flexibility of the underlying classes, but it usually provides all the function needed for all but the most sophisticated users. ...

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