The question:

Purpose: To write an Object-Oriented application that creates a Java class with several instance variables, a constructor to initialize the instance variables, several methods to access and update the instance variables values, along with other methods to perform calculations. Also, write a test class that instantiates the first class and tests the classs constructor and methods.

Details:

Create a class called Rectangle containing the following:

Two instance variables,

An instance variable of type double used to hold the rectangles width.

An instance variable of type double used to hold the rectangles height.

Provide a constructor with two parameters used to initializes each instance variable. The constructor should verify that the specified width and height values are greater than 0.0 and less than or equal to 20.0. If they are not, indicate an exception has occurred.

Provide get methods that return the values of each instance variables.

Provide set methods that set the instance variables to new values. The methods should also verify that the specified width and height values are greater than 0.0 and less than or equal to 20.0. If they are not, indicate an exception has occurred.

Provide a method called calculatePerimeter that calculates the perimeter of the rectangle and return that value as a double.

Provide a method called calculateArea that calculates the area of the rectangle and returns that value as a double.

Create a second class called RectangleTest that contains the main method, and thoroughly tests the Rectangle classs methods. This test class does not need to ask users for input. Just create the needed Rectangle objects to ensure that you test the Rectangle classs methods well.