class Factory {
   static final int NUM_WORKERS = 10;

   public static void main(String args[]) {
      Barrier wall = new Barrier(NUM_WORKERS);

      for (int i = 0; i < NUM_WORKERS; i++) {
         System.out.println ("Worker " + i + " just started");
         (new Thread(new Worker(i, wall))).start();
      }
   }
}