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An example of simple extension
We extend the 2D Point class to a 3D Point class
The class Point2D.
The class Point3D which extends class Point3d.
A client of the classes Point2D and Point3d.
The output from the Client program.
Go to exercise
Point3D: A client or a subclass of Point2D?

The class Point2D was a convenient starting point of the class Point3D

We have reused some data and operations from class Point2D in class Point3D