Challenge

Code the Chef and Waiter classes described in the previous section

Given this class hierarchy (tree):

	Shape
		Rectangle
			Square
		RightTriangle

Here is our problem write-up:

Shape is abstract.
Shape has an ivar named "description" of type "String"
We want to construct all Shapes with "newDescription" as the one constructor method parameter
Rectangle has two ivars: width and height (ints)
Square has no ivars
RightTriangle has two ivars: base and height (ints)
We want to construct Rectangle's with parameters: newDescription, newWidth, newHeight
We want to construct Square's with parameters: newDescription, newSide (note that newSide is the side dimension)
We want to construct RightTriangle's with parameters: newDescription, newWidth, newHeight
Shape has an abstract method "computeArea" that returns the (int) area of the shape (no method parameters)
Shape has an abstract method "computePerimeter" that returns the (int) area of the shape (no method parameters)

Implement Shape, Rectangle, Square, RightTriangle

Introduction To Objects With Java (Chapter 502 - Inheritance)