Supermarket Class : 

  private boolean newCustomer(){
        double x = newArrival.nextDouble();
        return (x < ARRIVAL_PROBABILITY);
   						
 -> method responsible for a arriving a customer at a random time.

   boolean newCheckOutNeeded = true;
        for (CheckOut co: checkOuts)
            if(co.getQueueSize() < MAX_QUEUE_SIZE)
            newCheckOutNeeded = false;			

-> boolean method that check the size of the current queue and if it's needed it will open a new checkout


   

Customer class : 

numberOfItems = (int)(rndm.nextGaussian()*STD_DEVN_NUMBER_OF_ITEMS) + MEAN_NUMBER_OF_ITEMS;
     processingTime = numberOfItems * TIME_PER_ITEM;
     
-> Gaussian Generator which is being used to generate random number of items. 



Checkout class :