Firefly[] fireflies = new Firefly[200];

void setup() {
  size(screen.width,screen.height);
  smooth();
  frameRate(30);
  for(int i = 0; i < fireflies.length; i++) {
    fireflies[i] = new Firefly(random(-100,width+100), random(-100, height+100), random(5,20));
  }
}

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