javac [options] [source-files]

阅读javac的文章，看到这句话
All options are indeed entirely optional. Source files can be directly specified as arguments to the javac command or kept in a referenced argument file as described later.
Notice that source files should be arranged in a directory hierarchy corresponding to the fully qualified names of the types they contain.

所有的选项都是optional，源文件可以直接作为javac命令的参数。 注意，源文件应该层次组织， corresponding to , the fully qualified names of the types they contain.

后面的不理解，the names of types they contain.  type指的是什么type? they是指的source file吧，它 有什么type?
求解惑，谢谢
原文：
https://www.baeldung.com/javac
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