22 FAÇADE
This pattern was previously described in GoF95.
DESCRIPTION
The Façade pattern deals with a subsystem of classes. A subsystem is a set of classes that work in conjunction with each other for the purpose of providing a set of related features (functionality). For example, an Account class, Address class and CreditCard class working together, as part of a subsystem, provide features of an online customer.
In real world applications, a subsystem could consist of a large number of classes. Clients of a subsystem may need to interact with a number of subsystem classes for their needs. This kind of direct interaction of clients with subsystem classes leads to a high degree of coupling between the client objects and the subsystem (Figure ...
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