Check out the beginners tutorial. If you need to do something do with X, follow the Hello X tutorial. i.e. if you need to do something with terrain, follow the Hello terrain tutorial. Those tutorials pretty much do exactly what your homework is asking.
I followed through those beginners tutorial without much of problems when I was learning Java. If you have previous experience in Java, you should be able to get through most of them by tomorrow. They are really as easy as any other Hello World tutorial.
Also if you need more time -talk to your instructor - as long you are making progress or working hard - instructors are usually reasonable to accommodate the need of the student.
Good luck with your
homework job interview.