Design Patterns and Best Practices in Java

Implementation

The following diagram shows how a subsystem's usage can be simplified and decoupled from the client code. The façade is the entry point to the subsystem; therefore, the subsystem code can easily be switched to a different implementation. The client dependencies can also be managed more easily and are more visible:

We can distinguish the following actors in the implementation diagram:

• Client: The subsystem client code
• Façade: The subsystem interface
• Subsystem: The classes defined in the subsystem