更好的解决方案是将包结构分解成两个源目录，一个负责客户端代码，一个负责服务器端代码，然后将公共类复制到两个目录中。

A more elegant solution might be to split package structure across two source directories for client-side and server-side code and to duplicate common classes into both directories.

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三个包client、server和public，位于指定源目录中的顶级包。

The three packages - client, server, and public -below your top-level package in the specified source directory.

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