August 2021
Intermediate to advanced
450 pages
4h 46m
Chinese
Content preview from 面向对象的思考过程（原书第5版）Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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1.8 封装和数据隐藏
使用对象的一个显著好处是对象无须暴露它的所有属性和行为。在出色的面向对象设计（至少通常认为是好的设计）中，对象仅暴露必要的接口来和其他对象进行交互。除了如何使用该对象，其他细节都应当对其他对象隐藏起来——基本上是一个“需要知道”的基础。
封装是基于对象既包含属性也包含行为这一事实定义的。数据隐藏是封装的主要部分。
例如，一个计算数字的平方值的对象必须提供一个接口来展示结果。然而，调用方无须知道该对象计算平方值的内部属性和算法。健壮的类会一直拥有良好的封装。下一小节中，我们会讲解接口和实现的概念，这是封装的本质。
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.