Exercises
To extend your knowledge of the subjects covered today, try the following exercises:
Modify the VolcanoRobot project from Day 2, "Object-Oriented Programming," so that it includes constructor methods.
Create a class for four-dimensional points called FourDPoint that is a subclass of Point from the java.awt package.
Where applicable, exercise solutions are offered on the book's Web site at http://www.java21days.com.
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