在你遇到需要从对象内部提取数据的设计问题时，模式匹配也有用，但是仅限一些特殊的情况。
Pattern matching is also useful for the design problem where you need to get at data inside an object, but only in special circumstances.
子系统的分析包含创建对象模型来表现内部工作方式，以及所包含的公开服务并且实现它们的子系统设计。
The analysis of the subsystem consists of creating object models to represent the internal workings and designs of the containing subsystems that will expose the services and realize them.
UML为设计师和开发者提供一个为面向对象系统和它们内部之间交互过程实现可视化的方法。
UML has given architects and developers a way of visually understanding object-orientated systems and their interactions.
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