Answer to Question #54253 in Java | JSP | JSF for Nicholas

Question

Each class must have private instance fields that store the specific shapes dimensions.
Each class must have a constructor that supplies the dimensions.
Each class must have an area() function.
Each class must have a toString() function that returns strings like these, as appropriate:
∗ triangle (base = 1.00, height = 2.00)
∗ rectangle (width = 1.00, height = 1.00)
∗ square (side = 1.00)
∗ circle (radius = 1.00)
All numbers are rounded to two decimal places.

Write a Main class that works like this:
$ java Main
?triangle 1.0 2.0
Area of triangle (base = 1.00, height = 2.00) = 1.00
? rectangle 1.0 2.0
Area of rectangle (width = 1.00, height = 2.00) = 2.00
? square 1.0
Area of square (side = 1.00) = 1.00
? circle 1.0
Area of circle (radius = 1.00) = 3.14
? quit
$

It does not need to handle bad user input.
Hint: Your Main class will be simpler if you exploit inclusion polymorphism. Have a single variable
of type Shape, instead of many variables with different types.