When you use the CECS Computer Labs, it is recommended (and in some applications it may be required) that you have the files you want to use in the local drive (the C:\ drive). This page lists the steps you need to create a local copy your CECS174 folder for you to work with while you use the computer in the lab.
The figure below shows the results of the steps above.
You now have a copy of your entire CECS174 directory, which should include the bookClasses Java source code and the mediasources folder with media files. You may go back to the guide on getting started in the CECS Labs. This link should take you back.