How to stop a task in ScheduledThreadPoolExecutor once I think it’s completed

run this test, it prints 1 2 3 4 5 and stops

public class ScheduledThreadPoolExecutorTest {
    static ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(15); // no
    static ScheduledFuture<?> t;

    static class MyTask implements Runnable {
        private int attempt = 1;

        public void run() {
            System.out.print(attempt + " ");
            if (++attempt > 5) {
                t.cancel(false);
            }
        }
    }

    public static void main(String[] args) {
        t = executor.scheduleAtFixedRate(new MyTask(), 0, 1, TimeUnit.SECONDS);
    }
}