import java.util.concurrent.*; 

class CyclicBarrierJoinP {

   static CyclicBarrier cb; 

   public static void done() {
      XXXX
   }

   public static void main(String[] args) {
      int numberofthreads = 10;

      Thread[] t = new Thread[numberofthreads];
      cb = XXXX;

      for (int j = 0; j < numberofthreads; j++) {
         (t[j] = new Thread( new ExThread() )).start();
      }

//    try {
//       for (int k = 0; k < numberofthreads; k++) t[k].join();
//    } catch (Exception e) { return; }

      XXXX;   
   }

   static class ExThread implements Runnable {
      public void run() {
         try {
            TimeUnit.SECONDS.sleep(10);
         } catch (Exception e) { return;};
         done();
      }
   }

}