这个文件必须位于根目录的路径下(不在任何包中),或者在类路径的一个目录的 META-INF 子目录中。
This file must reside in a root directory (outside any package) on the classpath, or in a META-INF subdirectory of a directory in the classpath.
如果这个路径已经存在,就需要确保它不包含任何文件或子目录。
If the path already exists, you need to make sure that it doesn't contain any files or subdirectories.
这个构造函数将每一个字符串解释为目录路径,并构造一个数据结构以表示这个路径下面的文件和子目录。
The constructor interprets each string as a directory path and builds a data structure to represent the files and child directories under that path.
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