public class Circle extends GeometricObject {
      private double radius;

      public Circle() {
      }

      public Circle(double radius) {
          this.radius = radius;
      }

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

      /** Set a new radius */
      public void setRadius(double radius) {
          this.radius = radius;
      }

      @Override /** Return area */
      public double getArea() {
          return radius * radius * Math.PI;
      }

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

      @Override /** 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);
      }
    }