CS2102 (B12): Object-Oriented Design Concepts
Recap and Practice, Week 1

What You Should Be Able to Do Now

At the end of week 1, you should be able to

• Define classes for simple programming problems, and for binary trees (trees with two branches per node).
• Use new to create objects out of classes, particularly examples of data in an Examples class.
• Write methods that return boolean, number, String, and objects of classes that you have defined.
• Write test cases for your methods in an Examples class.
• Define interfaces to introduce types for "one of the following classes" kinds of data.

Practice Problems

If working with trees still feels a bit complicated for you, implement the programs for this early 1101 homework assignment in Java (no Racket experience needed -- the problem statement is all in English). (Use strings wherever that problem set says "symbol".) This assignment does not need interfaces, but does exercise all the other weekly goals. Once you can do this problem, you can go back to trees via the first homework for 2102.

If you do work on the 1101 assignment in Java, check your work against the following criteria:

• Did you create two classes, one for film and one for date?
• Did you create at least two examples of each class?
• Did your difference-in-receipts method take one film as an argument?
• Did your modify-rating method take one string as an argument?
• Did your solution to opens-before? compare the dates in the film class, or the date class? (The date class is the correct location).

Feel free to bring your work on these to any of our office hours if you want a more detailed critique.