Question

Write a Circle Class that has the following fields:

• radius: a double

• PI: a final double initialized with the value 3.14159

• Constructor. Accepts the radius of the circle as an argument

• Constructor. A no-arg constructor that sets the radius field to 0.0.

• setRadius. A mutator method for the radius field.

• getRadius. An accessor method for the radius field.

• getArea. Returns the area of the circle, which is calculated as area = PI * radius * radius.

• getDiameter. Returns the diameter of the circle, which is calculated as diameter = radius * 2.

• getCircumference. Returns the circumference of the circle, which is calculated as circumference = 2 * PI * radius.

Write a program that demonstrates the Circle class by asking the user for the radius of a circle, creating a circle object, and then reporting the circle’s area, diameter, and circumference. See Rectangle example in book.

Submit:

1. Algorithm

2. UML diagram

3. A complete Java program with comments/documentation

4. Output

Test Data: Radius =0 5

Answer 1

class Circle {
   private double radius;
   private final double PI = 3.14159;

   // constructors
   public Circle(double aRadius) {
       super();
       radius = aRadius;
   }

   // getters and setters
   public double getRadius() {
       return radius;
   }

   public void setRadius(double aRadius) {
       radius = aRadius;
   }

   // returns area of circle
   public double getArea() {
       return PI * radius * radius;
   }

   // returns circumference of circle
   public double getCircumference() {
       return 2 * PI * radius;
   }

   // returns diameter
   public double getDiameter() {
       return 2 * radius;
   }

   // returns string representation of object
   public String toString() {
       return "Radius : " + getRadius() + " Diameter : " + getDiameter() + " Area : " + getArea() + " Circumference : "
               + getCircumference();

   }
}

public class Main {
   public static void main(String[] args) {
       Circle c = new Circle(5);
       System.out.println(c);

   }
}

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