 public class TestCircleWithPrivateDataFields {
 /** Main method */
 public static void main(String[] args) {
 // Create a circle with radius 5.0
 CircleWithPrivateDataFields myCircle = new CircleWithPrivateDataFields(5.0);
 System.out.println("The area of the circle of radius " + myCircle.getRadius() + " is " + myCircle.getArea());

 // Increase myCircle's radius by 10%
 myCircle.setRadius(myCircle.getRadius() * 1.1);
 System.out.println("The area of the circle of radius " + myCircle.getRadius() + " is " + myCircle.getArea());

 System.out.println("The number of objects created is " + CircleWithPrivateDataFields.getNumberOfObjects());
 System.out.println("");
  // Create a circle with radius 40
 CircleWithPrivateDataFields yourCircle = new CircleWithPrivateDataFields(40);
 System.out.println("The area of the circle of radius " + yourCircle.getRadius() + " is " + yourCircle.getArea());

 // Increase myCircle's radius by 10%
 yourCircle.setRadius(yourCircle.getRadius() * 1.5);
 System.out.println("The area of the circle of radius " + yourCircle.getRadius() + " is " + yourCircle.getArea());

 System.out.println("The number of objects created is " + CircleWithPrivateDataFields.getNumberOfObjects());
 
 }
 }