本文介绍了如何通过遵循两个基本原则来实现类的封装：不使用公共属性；仅引用作为参数传递给类的对象。
Implementing classes so that they adhere to the principle of encapsulation is quite simple. To achieve this goal, there are just two basic rules:
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Don't use any public properties.
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Don't reference objects outside the class unless the reference was passed to the class as a parameter.
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