// The Circle class is a subclass of the Widget class
// It inherits all attributes of Widget and adds a color attribute
class Circle extends Widget {
   // Attributes
   // inherit x, y, s from Widget
   color c;  // circle color

   // Constructor(s)
   Circle(float x, float y, float s, color c) {
   super(x, y, s);  // Calling the superclass's (Widget's) constructor
   this.c = c;
 } // Circle()

   // Methods

   // inherits jiggle() and toString() from Widget

   // Defines the display() abstract method
   void display() {
      push();
      ellipseMode(CENTER);
      fill(c);
      noStroke();
      ellipse(x, y, s, s);
      pop();
   } // display()

   // Adds a new method just for this class
   void changeColor() {
      c = color(random(255), random(255), random(255));
   } // changeColor()

  void jiggle() {
    s = s + random(-1, 1);
  } // jiggle()
} // class Circle