sclass DoubleFPSCounter {
  new FPSCounter counter1;
  new FPSCounter counter2;
  new Timestamp started;
  double counter;
  
  synchronized void inc() {
    if (counter1.secondsSinceStart() >= 1) {
      counter2 = counter1;
      counter1 = new FPSCounter;
    }
    counter1.inc();
  }

  synchronized double get() {
    ret counter2!;
  }
}