Design Patterns Java™ Workbook

Summary

Ordinarily, you should refactor the classes in a subsystem until each class has a well-defined purpose. This will make your code easier to maintain, but it can also make it difficult for a user of your subsystem to know where to begin. To help the developer who is using your code, you can supply demos or facades that go with your subsystem. A demo is usually a stand-alone, nonreusable application that shows one way to apply a subsystem. A facade is usually a configurable, reusable class with a higher-level interface that makes the subsystem easier to use.