清单3给出了包含目录和文件信息的一对类的代码。
Listing 3 gives the code for the pair of classes holding directory and file information.
根目录下面，包含文件和其他子目录，而子目录下，还有包含更多的子目录和文件，如此类推下去。
The root directory contains files and subdirectories, which contain more files and subdirectories and so on and so on.
这也就意味着，它们是由包含树形结构的目录(在其他系统中，叫做文件夹)组成的，就是说，在目录里面，可以包含其他的目录和文件。
This means that they are organized in a tree-like pattern of directories (called folders in other systems), which may contain files and other directories.
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