java执行器延迟不工作

Question

好的，所以我已经尝试了 3 种不同的延迟执行程序选项，用于我想在 5 秒后运行的 void/runnable/timertask，但我使用的所有代码都不起作用。他们会立即运行代码。

ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);  
executor.scheduleAtFixedRate(clearstage(), 10, 10, SECONDS);  
executor.shutdown();   

我试过的第二个代码:

ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();  
executor.scheduleWithFixedDelay(clearstage(), 0, 5, TimeUnit.SECONDS);  
executor.shutdown();  

对于那些我使用了这样的可运行任务:public Runnable clearstage(){//code}我也试过定时器任务:

reviveplayerover = clearstage();
Timer timer = new Timer();  
timer.scheduleAtFixedRate(reviveplayerover, 5000);  
reviveplayer(namee, name);   
timer.cancel();  

然后使用了:public TimerTask clearstage(){//code}

Answer 1

您需要确保您的“main()”方法不会在计划任务执行之前退出。

    // Example with a one-shot delay
    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    executor.schedule(clearstage(), 5, TimeUnit.SECONDS);
    executor.shutdown();
    executor.awaitTermination(6, TimeUnit.SECONDS);
    System.out.println("Done.");


    // And your clearstage() must be implemented like this:
    private static Runnable clearstage() {
      return new Runnable() {
        @Override
        public void run() {
            // Code goes here...
        }
      };
    }