Print “hello world” every X seconds

by

If you want to do a periodic task, use a ScheduledExecutorService. Specifically ScheduledExecutorService.scheduleAtFixedRate

The code:

Runnable helloRunnable = new Runnable() {
    public void run() {
        System.out.println("Hello world");
    }
};

ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
executor.scheduleAtFixedRate(helloRunnable, 0, 3, TimeUnit.SECONDS);

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