public class Circle extends GeometricObject {
    private double radius;
    public Circle() {
    }
    public Circle(double radius) {
        this.radius = radius;
    }
    public Circle(double radius,
                  String color, boolean filled) {
        this.radius = radius;
        setColor(color);
        setFilled(filled);
    }

    /** Return radius */
    public double getRadius() {
        return radius;
    }

    /** Set a new radius */
    public void setRadius(double radius) {
        this.radius = radius;
    }
    /** Return area */
    public double getArea() {
        return radius * radius * Math.PI;
    }
    /** Return diameter */
    public double getDiameter() {
        return 2 * radius;
    }
    /** Return perimeter */
    public double getPerimeter() {
        return 2 * radius * Math.PI;
    }
    // Print the circle info
     public void printCircle() {
     System.out.println("The circle is created "
             + getDateCreated() + " and the radius is " + radius);
    }
}