Firefly[] fireflies = new Firefly[2];

void setup() {
  size(800,600);
  smooth();
  frameRate(30);
  fireflies[0] = new Firefly(20,20,30);
  fireflies[1] = new Firefly(200,400,40);
}

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