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.
演示程序包中包含以下目录和文件。
The demo package contains the following directories and files.
目录根据其中包含的所有子目录和文件的总大小显示为绿色、黄色或红色。
Directories are colored green yellow or red based on their total size inclusive of all sub-directories and files.
一个引导程序包是一组目录和文件，其中包含用于说明系统必备组件的安装方式的清单文件。
A bootstrapper package is a group of directories and files that contain manifest files that describe how the prerequisite should be installed.
一个引导程序包是一组目录和文件，其中包含用于说明系统必备组件的安装方式的清单文件。
A bootstrapper package is a group of directories and files that contain manifest files that describe how the prerequisite should be installed.
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