Provides the local file system access. When one attempts to manipulate an object has been closed, we will throw this exception. This is a very critical group, largely to complete the class are all read and write files. You can literally try to understand what it means. I did not used to this class, do not know the specific function. The file system directory used to monitor changes in the status, such as file deletion, adding, memory cards, pull out, and insertion. The file system for managing and tracking the listener, as well as through these past all current file system root directory. File Open Mode Exception, when trying to write to read-only open file, it will throw the exception.

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