Java realizes flow control-semaphore__java

Online similar to a lot of articles, not to say, directly on the code:

[java]  View plain  copy/**   *  flow control (semaphore implementation)    *    * @ author ln   *   */   public class flowcontrol {          /**       *  Maximum traffic         */       private static final int max_ access_count = 20;          /**        *  can only have max_access_count number of threads simultaneous access        */        private static final semaphore semaphore = new semaphore (MAX_ACCESS_ COUNT);          public static void main (String[]  args)  {           //  thread pool        &nbsP;    executorservice exec = executors.newcachedthreadpool ();              //  Simulation 30 clients             for  (int i = 0; i < 30; i++)  {                runnable run =  new runnable ()  {                     @Override                     public void run ()  {                        try  {                       &nbThe access is discarded if no permission is available within the sp;    // 1 seconds.                             if  (Semaphore.tryacquire (1, timeunit.seconds))   {                    &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Executing ...");                                 //do some things ...                                 thread.sleep (2 * 1000);                    &nbsP;           system.out.println ("execution completed.") ");                            } else {                           &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Access denied ...") ");                            }                        } catch  ( Interruptedexception e)  {