My style is one possible model. The comment that appears above a class is the most important one. Why did you take the trouble to define the class. A comment that is one sentence in length for a class is rarely sufficient documentation. Please document each non trivial method properly.
Documentation requires the use of complete English sentences with proper English syntax.
I want one Java program from each team. Include a look back at the bottom of the file as a comment. In a look back you discuss what was difficult about the lab and what you learned from the lab. You can include constructive suggestions for improvement of the lab. The lookback should be at least one paragraph in length.