A quick look to the UML diagram:

– Three interfaces ForTwoD, Shape and ForThreeD  

– TwoD class implements ForTwoD and Shape interfaces  

– ThreeD class implements ForThreeD and Shape interfaces  

– Four subclasses to TwoD (Circle, Rectangle, Triangle and Trapezoid)  

– Three subclasses to ThreeD (Cuble, Trapezoid and Cube)  

– 

Implement the Shape hierarchy as shown in the above diagram  

– Basically, each two-dimensional shape needs to compute its   

area and its perimeter.  

– Each three-dimensional shape needs to compute its area 

(also known as surface area) and its volume.  

– Try to surf the internet to look for some formulas, for example, to  

compute the areas, the surface areas, and the volumes … I did that too  

? 

A more detailed UML diagram is shown as follow: (Note that the #’s before  

the instance variables and the methods’ names mean “protected”)