Be sure to create the full directory structure matching the package name for these classes.

请确保创建与这些类的包相匹配的、完整的目录结构。

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Create the full-size application's organizational package, interface, and class structure, even if the files do nothing more than declare the class name and the interface it implements initially.

创建完整大小应用程序的组织包、界面和类结构，即使这些文件的作用只是声明最初实现的类名称和接口。

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