清单1中FileVisitor的实现，应当为其访问的每个目录和文件打印消息，并给出从其 BasicFileAttributes 中获取的文件大小。
The FileVisitor implementation in Listing 1 should print a message for each directory and file it visits and also give the size of the files from their BasicFileAttributes.
清单1中FileVisitor的实现，应当为其访问的每个目录和文件打印消息，并给出从其 BasicFileAttributes 中获取的文件大小。
The FileVisitor implementation in Listing 1 should print a message for each directory and file it visits and also give the size of the files from their BasicFileAttributes.
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