schedule vs scheduleAtFixedRate

最好的方法是在两者之间区分 timer灵感时间设定过去时间T，scheduleAtFixedRate将从T现在所有的任务中运行，schedule而该任务将只运行从现在开始计时。

public class HelloMain {

    private static int count = 0;

    public static void main(String[] args) {

        Date date = new Date(System.currentTimeMillis() - 3000);

        Timer timer = new Timer();

        System.out.println("timer schedule before");

        timer.scheduleAtFixedRate(new TimerTask() {

            @Override

            public void run() {

                count++;

                System.out.println(count + " timer task run " + Calendar.getInstance().getTime());

            }

        }, date, 1000);

        System.out.println("timer schedule after");

        try {

            Thread.sleep(6000);

        } catch (InterruptedException e) {

            e.printStackTrace();

        }

        System.out.println("timer cancel before");

        timer.cancel();

        System.out.println("timer cancel after");

    }

}