Cicles Class and Tester in Java: Problem Specification the Circle class represen

Question

Cicles Class and Tester in Java:

Problem Specification

the Circle class represents circles. A circle has a color ("red", "yellow", "blue"), and a radius. separate circle methods must retrun the color, calculate and return the circumference, and calculate and retrun the area.

the CircleTester class uses the Circle class, gets user input to create a new circle and does calculations on it.

The Circle Class

Paratial pseudocode outline of Circle:

constants: set PI to 3.1415926

instance variables:

as specified above

methods:

constructor(radius parameter, color parameter)

initialize all instance variables

-design other methods, parameters and return types as specified above. NONE OF THE CIRCLE METHODS PRINT OUT ANTHING. Instead, all of them return a value back to the method classa in CirlceTester.

algorithms:

circumference is 2PIr

area is PIrr

The CircleTester Class

put all CircleTester code into the main() method. Declare in main() any local variables that are needed. Here is pseudocode outline.

instance variables:

none

methods: main()

prompt user for and read from the keyboard a radius

prompt user for and read from the keyboard a color (use next())

create a new Circle object with this radius and color

print the color of the circle. Call a Circle method as you do this.

print the circumference of the circle (to 2 decimal places) call a Circle method as you do this.

print the area of the circle (to 2 decimal places) call a Circle method as you do this

Explanation / Answer

Please find the required solution:

import java.text.DecimalFormat;
import java.util.Scanner;

//declaration of class circle
class Circle {
   public static final double PI = 3.1415926;
   String color;
   double radius;

   // two argument constructor for circle
   public Circle(String color, double radius) {
       this.color = color;
       this.radius = radius;
   }

   // getter and setter for properties
   public String getColor() {
       return color;
   }

   public void setColor(String color) {
       this.color = color;
   }

   public double getRadius() {
       return radius;
   }

   public void setRadius(double radius) {
       this.radius = radius;
   }

   // calculate and return circumference
   public double getCircumference() {
       return 2 * PI * this.radius;
   }

   // calculate and return area
   public double getArea() {
       return PI * this.radius * this.radius;
   }
}

public class CircleTester {
   public static void main(String[] args) {

       // read input from keyboard(resource)
       Scanner input = new Scanner(System.in);
       System.out.println("enter the radius:");
       double radius = input.nextDouble();
       System.out.println("enter the color:");
       String color = input.next();

       // create object of circle
       Circle circle = new Circle(color, radius);

       // formatter used to limit decimal place to 2
       DecimalFormat formatter = new DecimalFormat(".00");

       // print the result
       System.out.println("Color of circle:" + circle.getColor());
       System.out.println("Circumference of circle:" + formatter.format(circle.getCircumference()));
       System.out.println("Area of circle:" + formatter.format(circle.getArea()));

       // close the resource
       input.close();
   }
}

Sample output:

enter the radius:
15
enter the color:
red
Color of circle:red
Circumference of circle:94.25
Area of circle:706.86

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