public class CircleDemo {
    public static void main(String[] args){
        System.out.println("num circles: " + Circle.getNumCircles());

        Circle c1 = new Circle(1);

        System.out.println("num circles: " + Circle.getNumCircles());

        System.out.println(c1);
        c1.setName("A very happy circle");
        System.out.println(c1);

        Circle c2 = new Circle(5);
        System.out.println(c2);
        c2.setRadius(7);
        System.out.println(c2);
        System.out.println(c1);

        System.out.println("num circles: " + Circle.getNumCircles());
    }
}