如何使用ScheduledExecutorService重新安排任务？

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ScheduledExecutorServiceExample {
    public static void main(String[] args) {
        // 创建一个ScheduledExecutorService实例
        ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);

        // 创建一个Runnable任务
        Runnable task = () -> System.out.println("Task executed at " + System.currentTimeMillis());

        // 使用scheduleAtFixedRate()方法安排任务
        executor.scheduleAtFixedRate(task, 0, 5, TimeUnit.SECONDS);

        // 关闭ScheduledExecutorService实例
        executor.shutdown();
    }
}