CSC 172 
Homework 3

Assigned 27 Sept, due 4 Oct

• Before you start, fill out a Product Plan Estimate form in the PSP package (click on "Input" under "Product Plan Estimates").
• As you go, or when you're done, fill out a time log form in the PSP package (click on "Input" under "Time Management Data").
• Every time you find and fix a defect, record it using the PSP package (click on "Input" under "Defect Removal Data").
• For this and all your programming assignments, follow the appropriate design recipe(s). Among other things, each method should be documented with examples and the results they should produce (write these before writing the code!); be sure to test the method thoroughly before turning it in.
• Each class, method, and variable should have a well-chosen, meaningful name.
• Each class should have a static void test() method where you put all your standard test cases relevant to this class.
• All javadoc comments (and all comments, for that matter) should be correct and up-to-date; a misleading comment is worse than none at all.

 
• Modify your collection of classes from homework 2 by adding a Shape class with appropriate abstract (and not-so-abstract) methods.  Try to avoid duplication of code.  The Shape class doesn't need a toString method or an equals method, since all of its concrete subclasses already have those (from homework 2; if you didn't write them for homework 2, write them now), but it should have its own test method that tests the ability to work with different kinds of shapes, and in particular the ability to store different kinds of shapes in Shape variables and have them behave appropriately.