SOLVED: Create a class named Square that contains data fields for height, width, and surfaceArea, and a method named computeSurfaceArea(). Create a child class named Cube, which contains an additional data field named depth, and a computeSurfaceArea() method that overrides the parent method. Write an application that instantiates a Square object and Cube object and displays the areas of the objects.

Java Fields vs. Java Methods

Java - Compute the area of a polygon