If a class contains only static members, remember to mark the class as static or seal the class (NotInheritable) and give the class a private constructor to avoid instance creation.

如果类只包含静态成员，则要记得将该类标记为静态，或者密封该类(NotInheritable)，并且还要为该类提供一个私有构造函数，以避免实例创建。

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A private constructor is a special instance constructor.

私有构造函数是一种特殊的实例构造函数。

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Do classes that should not be instantiated have a private constructor?

不需要实例化的类有私有构造函数吗？

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