Complexity Simplified by Modularity
When designing a system, certain concepts will naturally sit together. By placing these into shared modules, a certain amount of separation can be achieved that is independent of the layering discussed so far. Functionality can be split into classes, and these classes can be grouped in packages or components. By reducing the dependencies between the classes and packages, this functionality can be used by different parts of the application. By defining and maintaining interfaces between classes and packages, the actual implementation of a class can be replaced without requiring a change to other classes that depend on it. The Unified Modeling Language (UML) diagram in Figure 1.4 shows this type of decomposition. ...
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