2 Bubble class processing

class Bubble{
  int x, y, d;
  color c;

  Bubble(){
    x = (int)(Math.random() * width/2);
    y = height;
    c = (int)(Math.random() * 256);
    d = (int)(Math.random() * 40 + 5);
  }

  void ascend(){
    y--;
    x += (int)(Math.random() * 10 - 5);
  }

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