问一个 ExecutorService 的问题

想知道 ExecutorService 提交的任务先 sleep1 秒是何意义？

    ExecutorService executor = Executors.newSingleThreadExecutor();
    executor.submit(() -> {
        try {
            Thread.sleep(1000);

            doSomething();

        } catch (Exception e) {
            logger.error("异步接口执行失败", e);
        }
    });