java中TimerTask是什么

public static void main(String[] args) {

        Timer timer = new Timer();

        final CalculatePrimes calculator = new CalculatePrimes();

        calculator.start();

        timer.schedule(

                new TimerTask() {

                    public void run()

                    {

                        calculator.finished = true;

                    }

                }, TEN_SECONDS);

    }