// Example OOP: Ball as a class
class Ball {
  // Attributes/Properties of all Ball objects
  float x, y;     // location in sketch
  float radius;  // ball radius
  color ballColor;
  
  // Constuctors
  Ball() {
    x = random(width);
    y = random(height);
    radius = 25;
    ballColor = color(0);
  } // end of Ball constructor
  
  Ball(float r) {
    x = random(width);
    y = random(height);
    radius = r;
    ballColor = color(0);
  } // end of Ball constructor
  
  // behaviors/methods
  void display() {
    push();
    fill(ballColor);
    circle(x, y, 2*radius);
    pop();
  } // display()
  
} // end of class Ball