Part A) Read and Review

It's time to review your Java (if you haven't already), and learn about some tools we will be using for our implementations this semester.

• Review your favorite Java textbook and/or the examples on the intro Java course website: www.cs.jhu.edu/~joanne/cs107/code
• Read about Checkstyle and what various errors may mean: Checkstyle website
• If you'd like to get better using Unix and an editor, read the documents posted at the bottom of the tools section of our main course webpage.
• Install the checkstyle plug-in for Eclipse on your laptop. You can try to configure this yourself, but we will do it together in class on Wednesday.
• Read about JUnit for unit testing in java: JUnit tutorial, JUnit downloads and basics (revised link)

Part B) Clean Java Code [20 points]

If you haven't already, download the timeSomething.java class from the notes directory. The purpose of this assignment is to clean it up!

1. [4] Add a comment at the beginning with your name, blackboard login, and an explanation of what this program actually does.
2. [10] Eliminate all the checkstyle errors from this file, based on our jhu_checks.xml configuration file (similar to what we did in class on Friday with SearcherBetter.java).
3. [4] Continue editing the file to eliminate as many code redundancies and inefficiencies as possible.
4. [2] Throw appropriate exceptions when input errors occur instead of printing error messages and exiting the program.
5. Make sure your new version still compiles, runs properly, and complies with checkstyle (no errors).
6. Submit your final version source code on Blackboard as hw3 and also bring a hardcopy printout of your solution to class. Remember, you may submit multiple times before the deadline. We will only grade your last (most recent) submission unless you ask otherwise.