Question

****Here is the assignment ****
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 class’s 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 rectangle’s width.
An instance variable of type double used to hold the rectangle’s 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 class’s 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 class’s methods well. The thoroughness of your testing in will impact your grade.

Note: Ensure that your program is properly formatted and it follows all Java naming conventions.

*****we are suppose to take this old code and update it to this ****
Details:
Rewrite the Rectangle class you wrote for Chapter 8 programming assignment to throw an IllegalArgumentException indicating there is a problem with the input parameters in the constructor and the set methods.

Also, rewrite the RectangleTest class from Chapter 8 to handle the exceptions thrown by the Rectangle class. Thoroughly tests the Rectangle class’s 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 class’s methods well. The thoroughness of your testing in will impact your grade.

*************Rectangle class**********************

//edit chapter 08

import java.util.Scanner;

public class Rectangle {

private double width;

private double height;

public Rectangle(double height, double width)//constructor

{

this.height = height;

this.width = width;

}

public void setHeight(double height)

{

if (height < 0.0 || height > 20.0) // validation

throw new IllegalArgumentException("Height should be between 0.0 and 20.0");

this.height = height;

}

public double getHeight()

{

return height;

}

public void setWidth(double width)

{

if (width < 0.0 || width > 20.0) // validation

throw new IllegalArgumentException("Width should be between 0.0 and 20.0");

this.width = width;

}

public double getWidth()

{

return width;

}

public double calculateArea()

{

return height*width;

}

public double calculatePerimeter()

{

return 2*(height+width);

}

public void display()

{

System.out.println("Rectangle Length : "+height+ " Width : "+width+" Area : "+calculateArea()+" Perimeter : "+calculatePerimeter());

}

}

*******RectangleTest******

import java.util.Scanner;

public class RectangleTest2 {

public static void main (String[] args)

{

Scanner input = new Scanner(System.in);

double height,width;

try { Rectangle r = new Rectangle () ; //create the obj of rectangle class

System.out.println("Height or Width of the rectangle should be in range of 0.0 and 20.0");

Rectangle rect = new Rectangle (16,5);

//call the method and print the Perimeter of the rectangle

System.out.println("Perimeter of Rectangle is : " +rect.calculatePerimeter());

//call the method and print area of Rectangle

System.out.println("Area of rectangle is : " +rect.calculateArea());

//create obj of rectangle class

rect.setHeight(21);;

r.display(); }

catch(IllegalArgumentException e )

{

}

}

}

Answer 1

Rectangle.java

============================================================================================

public class Rectangle {

private double width;

private double height;

//throw an IllegalArgumentException indicating there is a problem with the input parameters in the constructor.
public Rectangle(double height, double width)//constructor

{
   if (height < 0.0 || height > 20.0) // validation

       throw new IllegalArgumentException("Height should be between 0.0 and 20.0");
   else if (width < 0.0 || width > 20.0) // validation
       throw new IllegalArgumentException("Width should be between 0.0 and 20.0");
  
   this.height = height;
   this.width = width;

}
//throw an IllegalArgumentException indicating there is a problem with the input parameters in the set()
public void setHeight(double height)

{

if (height < 0.0 || height > 20.0) // validation

throw new IllegalArgumentException("Height should be between 0.0 and 20.0");

this.height = height;

}

public double getHeight()

{

return height;

}

//throw an IllegalArgumentException indicating there is a problem with the input parameters in the set()
public void setWidth(double width)

{

if (width < 0.0 || width > 20.0) // validation

throw new IllegalArgumentException("Width should be between 0.0 and 20.0");

this.width = width;

}

public double getWidth()

{

return width;

}

public double calculateArea()

{

return height*width;

}

public double calculatePerimeter()

{

return 2*(height+width);

}

public void display()

{

System.out.println("Rectangle Length : "+height+ " Width : "+width+" Area : "+calculateArea()+" Perimeter : "+calculatePerimeter());

}

}

============================================================================================

RectangleTest.java

import java.util.Scanner;

public class RectangleTest {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner input = new Scanner(System.in);

       double height,width;

       try {
             

       System.out.println("Height or Width of the rectangle should be in range of 0.0 and 20.0");
       Rectangle r = new Rectangle (2,3) ; //create the obj of rectangle class
       r.display();
      
       //create obj of rectangle class
       Rectangle rect = new Rectangle (21,50);

       //call the method and print the Perimeter of the rectangle

       System.out.println("Perimeter of Rectangle is : " +rect.calculatePerimeter());

       //call the method and print area of Rectangle

       System.out.println("Area of rectangle is : " +rect.calculateArea());

      

      
      
       }

       catch(IllegalArgumentException e )

       {
           System.out.println(e);

       }

   }

}

============================================================================================

Output