How should I format and comment my code?

Here are some recommended style guidelines adapted from PU COS 226. Below are some that are particularly important (and for which you will lose points if you ignore).

• Include a bold (or Javadoc) comment at the beginning of each Java file with your name, login, date, the description of the program, and how to execute it.
• Include a comment describing every method and class (whether public or private).
• Include a comment describing every instance variable (including those for nested classes).
• Indent consistently, using 3 or 4 spaces for each indentation level. Do not use hard tabs.
• Do not exceed 80 characters per line. This rule also applies to the readme.txt file.
• Avoid unexplained magic numbers, especially ones that are used more than once.

What is unit testing? It is testing of each method within a class. Ideally, it should be comprehensive enough to catch any error in the class.