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

Use a ScheduledExecutorService:

ScheduledExecutorService ses = Executors.newSingleThreadScheduledExecutor();
ses.scheduleAtFixedRate(new Runnable() {
    @Override
    public void run() {
        sendScreenShot();
    }
}, 0, 1, TimeUnit.HOURS);

Prefer using a ScheduledExecutorService over Timer: Java Timer vs ExecutorService?