Through this class, you can access information on the change, such as whether it's a new file, a deletion, or a file change.

通过这个类，您可以访问有关更改的信息，例如，更改是新建文件、删除还是文件更改。

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The two nulls indicate that we do not want to change the last access time or creation time for this file.

这两个null指出，我们不想改变这一文件的最后访问时间或者创建时间。

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If you do not have shell access, you can change file permissions with most decent FTP clients.

如果不能通过shell访问，可以通过更正规的FTP客户端更改文件授权。

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