Run java function every hour

Question

I want to run a function every hour, to email users a hourly screenshot of their progress. I code set up to do so in a function called sendScreenshot()

How can I run

Answer 1

For this type of period execution, meaning every day or every hour, all you need is using a Timer like this :

public static void main(String[] args) throws InterruptedException {
        Calendar today = Calendar.getInstance();
        today.set(Calendar.HOUR_OF_DAY, 7);
        today.set(Calendar.MINUTE, 45);
        today.set(Calendar.SECOND, 0);

        Timer timer = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                System.out.println("I am the timer");
            }
        };
//        timer.schedule(task, today.getTime(), TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS)); // period: 1 day
        timer.schedule(task, today.getTime(), TimeUnit.MILLISECONDS.convert(5, TimeUnit.SECONDS)); // period: 5 seconds

    }

this exemple will execute the timetask every 5 seconds from the current date and 7:45 am. Good Luck.