Due Date: Wednesday of week 04

The following guidelines are expected for all homework submissions:

• All homework must be typed. Homework which is not typed will be returned ungraded and will be subject to the late homework guidelines as set out on the syllabus page. PLEASE DO NOT scribble something on lined paper and rip it out of your spiral notebook — hanging chads went out with the presidential election in 2000.
• I don't care too much about what font you use or how large your margins are; however, you might want to check out a monospaced font for typing code, as it will be easy to see the indentations.
• Speaking of indenting, PLEASE DON'T USE TABS TO INDENT YOUR CODE. Tabs can often get interpreted differently by different computers, peripherals, and applications, and could make code that is nicely formatted on *your* computer look all over the map on *my* computer or in my editor. USE SPACES INSTEAD. You can set up almost every modern text editor to insert spaces whenever you press the TAB key, or you can simply pound the spacebar.
• On assignments 1, 2, and 3, WORK BY YOURSELF. On assignments 4 and 5, WORK WITH A PARTNER. I can't stress this enough; part of this policy is don't split up the work – WORK TOGETHER on the assignment. This activity mimics an industry code development model called pair programming which is part of the Extreme Programming software development method. Feel free to collaborate in your pairs as much as you want, doing the entire assignment together.
• DO NOT share your work between groups. Doing so will count as plagiarism. If you wish to discuss solutions with another group over coffee in the Lair, that's fine as long as it is kept at the conceptual level and you don't share your code between groups. Each group needs to turn in its own version of the solutions.
• You only need to turn in ONE COPY per group.
• MAKE SURE YOUR GITHUB REPO IS PRIVATE [for reasons explained on the syllabus page and in class].
• Submit your homework through GitHub, in your repository, to which I must be a contributor or have otherwise been allowed access. I cannot evaluate what I cannot see!

Problems for Assignment #2

Learning Outcomes: 1) Get used to programming in Java; 2) find out how to use arrays and several primitive data types in Java; 3) write test cases using the main method in your source code with lots of test cases; 4) practice adding new methods into an existing program; 5) practice determineing and adding expanded test cases to cover the added methods

You will be using the HighArray class from the textbook for this homework assignment. This class uses an array and demonstrates insertion, deletion, and location operations. The implementation is not too difficult. The base class file (Listing 2.3) is on pages 49-50. There is a separate class that contains the main method for this program, called HighArrayApp which begins at the bottom of page 50. Your task is to use these two classes to implement the following projects.

1. First, create the HighArray.java source file. Be sure to use good coding practices to make your code pretty, artful, and maintainable. You can copy and paste the source code from the text book, which will make your life easier.
2. Compile that source code to make sure there are no errors.
3. Create the HighArrayApp.java file in the same way. Compile that source as well, to make sure there are no errors. NOTE THIS IS A SEPARATE FILE – don't include this code in the same class file as HighArray.java, the way it is in the textbook!
4. Compile the HighArrayApp.java source code to make sure there are no errors.
5. Run the HighArrayApp program to ensure everything works properly.
6. Now, to the HighArray class in the HighArray.java program, add a method called getMax() that returns the value of the highest key in the array, or –1 if the array is empty. Add some code in the main() method in the HighArrayApp.java to test this method. You can assume all the keys are positive numbers. Add AT LEAST FIVE new test cases, which means you will need to add or remove values from the array between calls to the getMax() tests.
7. Write a noDups() method for the HighArray class of the HighArray.java program. This method should remove all duplicates from the array. That is, if three items with the key 17 appear in the array, noDups() should remove two of them. Don’t worry about maintaining the order of the items. One approach is to first compare every item with all the other items and then overwrite any duplicates with a null [or a distinctive value that isn't used for real keys]. Then remove all the nulls. Of course, the array size must be reduced correctly.
8. Submit both your source code files to your repo. You only need to submit the source files, NOT THE CLASS FILES. THERE MUST BE TWO JAVA SOURCE FILES IN YOUR REPO FOR THIS ASSIGNMENT.