OOP Processing

class Ball{
  float x;
  float y;
  float d;
  float speedx;
  float speedy;
  color c;

  Ball(){
    x = random(100, 500);
    y = random(100, 500);
    d = random(5, 100);
    speedx = random(1, 5);
    speedy = random(1, 5);
    c = color(random(0, 255), random(0, 255), random(0, 255));
  }

  void display(){
    fill(c);
    ellipse(x, y, d, d);
  }

  void move(){
    x += speedx;
    y += speedy;
  }
  void reflect(){
    if (x > width || x < 0){
      speedx = -speedx;
    }
    if (y > height || y < 0){
      speedy = -speedy;
    }
  }
}


Ball[] balls;

void setup(){
  size(600, 600);
  balls = new Ball[100];
  for (int i = 0; i < balls.length; i++){
    balls[i] = new Ball();
  }
}

void draw(){
  background(255);
  for (int i = 0; i < balls.length; i++){
    balls[i].display();
    balls[i].move();
    balls[i].reflect();
  }
}