First, we must work at the class and file level.

首先，我们必须处理类和文件层。

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That similarity must happen at both the package level and the file level.

这种相似性必须同时出现在包级别与文件级别。

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At the class file level, all class names are fully qualified.

在类文件的水平，所有类的名称是完全合格的。

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At the class file level, all class names are fully qualified.

在类文件的水平，所有类的名称是完全合格的。

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