Java线程池运行状态监控实现解析

private static ExecutorService es = new ThreadPoolExecutor(50, 100, 0L, TimeUnit.MILLISECONDS,
    new LinkedBlockingQueue<Runnable>(100000));
 
public static void main(String[] args) throws Exception {
  for (int i = 0; i < 100000; i++) {
    es.execute(() -> {
      System.out.print(1);
      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    });
  }
 
  ThreadPoolExecutor tpe = ((ThreadPoolExecutor) es);
 
  while (true) {
    System.out.println();
 
    int queueSize = tpe.getQueue().size();
    System.out.println("当前排队线程数：" + queueSize);
 
    int activeCount = tpe.getActiveCount();
    System.out.println("当前活动线程数：" + activeCount);
 
    long completedTaskCount = tpe.getCompletedTaskCount();
    System.out.println("执行完成线程数：" + completedTaskCount);
 
    long taskCount = tpe.getTaskCount();
    System.out.println("总线程数：" + taskCount);
 
    Thread.sleep(3000);
  }
 
}