public static void main(String[] args) {
		long threadId = Thread.currentThread().getId();
		ExecutorService exec = Executors.newCachedThreadPool();
//		ExecutorService exec = Executors.newFixedThreadPool(3);
//		ExecutorService exec = Executors.newSingleThreadExecutor();
		for (int i = 0; i < 5; i++)
			exec.execute(new LiftOff());
		exec.shutdown();
	}