我正在創(chuàng)建一個調(diào)度程序并安排一個延遲 2 秒的作業(yè)。但在安排特定作業(yè)之前，我想檢查 ScheduledExecutorService 的池大小和隊(duì)列大小，但我找不到任何方法。任何人都可以向我建議如何在安排任何作業(yè)之前檢查 ScheduledExecutorService 的池大小和隊(duì)列大小。   //here i have created ScheduledExecutorService private static final ScheduledExecutorService SCHEDULED_EXECUTOR_SERVICE;static {     //initialized  ScheduledExecutorService with 30 pool size    Scheduled_Executor_Service = (ThreadPoolExecutor) Executors.newScheduledThreadPool(30);}public void addTaskTOSchedule(){  //Here i want to check poolsize and queue size of SCHEDULED_EXECUTOR_SERVICE if   //ScheduledExecutorService already used more then specific number thread then i will not schedule jobSCHEDULED_EXECUTOR_SERVICE.schedule(() -> {                    User user = new User();                    SCHEDULED_EXECUTOR_SERVICE.execute(user);                }, 2000, TimeUnit.MILLISECONDS);}