[T3A4][W09-A3]Yim Chia Hui

[sharkey1314]

Added check for storage file while program is running...

[sharkey1314]

Ready for review

[hwkchia]

As mentioned during the lecture, the program in the original form continues to work even when the file is deleted by creating a new file; so the use of an exception might be questionable.

Anyway, here is some general feedback on how an exception can be used. There are generally two ways to do this:

• Terminate if the file is deleted. This is the straightforward approach, but it degrades the user experience. The exception should be thrown from StorageFile::save() method. The best place to catch and terminate is Main::executeCommand() (this method already has a catch block to terminate upon exception.

• Warn but continue. Need to detect the file deletion at the beginning of the StorageFile::save() method but throw the exception at the end of the method. It should be caught in Main::executeCommand() but should show a warning to the user instead of terminating program.

Also, one should not use exceptions to replace the normal workflow (e.g., using exception in place of if … else)