code:

public static void main(String[] args) {
    final ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
    executorService.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            heartBeat();
        }
    }, 0, 1, TimeUnit.SECONDS);
}

private static void heartBeat() {
    System.out.beat();
}