Java Write a Circle class that has the following member vari

Java

Write a Circle class that has the following member variables; · radius: a double · pi: a double with value 3.142 · The class should have the following member functions: · Default Constructor. A default constructor that sets radius to 0.0. · Constructor. Accepts the radius of the circle as an argument. · setRadius. A mutator function for the radius variable. · getRadius. An accessor function for the radius variable. · 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 = 2 * radius · 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 circle’s radius, creating the Circle object, and then reporting the circle area, diameter, and circumference.

Solution

CircleTest.java

import java.util.Scanner;

public class CircleTest {

  
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.println(\"Enter the circle radius: \");
       double radius = scan.nextDouble();
       Circle c = new Circle(radius);
       System.out.println(\"Circle area: \"+c.getArea());
       System.out.println(\"Circle diameter: \"+c.getDiameter());
       System.out.println(\"Circle circumference: \"+c.getCircumference());

   }

}

Circle.java

public class Circle {
   private double radius;
   private double pi = 3.142;
   public Circle(){
       radius = 0.0;
   }
   public Circle(double radius){
       this.radius = radius;
   }
   public double getRadius() {
       return radius;
   }
   public void setRadius(double radius) {
       this.radius = radius;
   }
   public double getArea(){
       return pi * radius * radius;
   }
   public double getDiameter(){
       return 2 * radius;
   }
   public double getCircumference(){
       return 2 * pi * radius;
   }
}

Output:

Enter the circle radius:
3
Circle area: 28.278
Circle diameter: 6.0
Circle circumference: 18.852