我认为完成任务后如何停止ScheduledThreadPoolExecutor中的任务

运行此测试，它会打印

1 2 3 4 5

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);    }}