Parameter help?

I am creating a program to simulate a store. I have several methods listed below that imitate a customer arriving to the store, and a customer departing the store. I have a simulate method that simulates the entire store day. In my simulate() method under in the departure part, I cannot figure out how to call the number of the cashier for the parameter. I call the customerDeparts() method line 111, 112 and need two parameters, num of cashier, and currentTime. Any ideas on how to call the value of the cashier? Thanks.

Java Code:

    /********************************************
     * Customer to cashier
     * @param number of cashier
     ********************************************/
    private void customerToCashier (int num){

        //Move first customer to cashier
        if(inLine.size() > 0){
            cashiers[num] = inLine.remove(0);
        }

        //Update customers served
        customersServed ++;

        //Update total wait time
        waitTime += currentTime - cashiers[num].getArrivalTime();

        //Future time for departure
        double futureTime = currentTime + futureEventTime(serviceTime);

        //Create new departure event + add to priority queue
        GVevent next = new GVevent(GVevent.DEPARTURE, futureTime, num);
        myEvents.add(next);

    }

    /********************************************
     * Customer Arrives
     * @param time of customer getting in line
     ********************************************/
    public void customerArrives (double t){

        //Update current time
        currentTime = t;

        //Create new customer, add to line
        Customer c = new Customer(t);
        inLine.add(c);

        //Check for if longest line
        if(inLine.size() > longestLine){
            longestLine = inLine.size();
            longestTime = currentTime;
        }

        //Move first customer in line to available cashier
        int i = cashierAvailable();
        if(i >= 0){
            customerToCashier(i); 
        }

        //Generate future time
        double n = futureEventTime(arrivalTime);

        //Check time to make sure not after closing, add to queue
        if(n < CLOSE){
            GVevent next = new GVevent(GVevent.ARRIVAL, t); 
            myEvents.add(next);
        }
    }

    /********************************************
     * Customer Departs
     * @param num of cashier available
     * @param time
     ********************************************/
    public void customerDeparts (int num, double t){

        //Update current time
        currentTime = t;

        //Retrieve customer from cashier[num]
        customerToCashier(num);

        //Check to see if cashier gets new customer
        if(inLine.size() > 0){
            cashiers[num] = inLine.remove(0);
        }else{
            cashiers[num] = null;
        }

    }

    /********************************************
     * Simulation of store
     ********************************************/
    public void simulate(){

        //Reset Parameter
        currentTime = OPEN;
        customersServed = 0;
        myEvents = new PriorityQueue <GVevent> ();

        //First Arrival
        GVevent a = new GVevent(GVevent.ARRIVAL, currentTime);
        myEvents.add(a);

        //Continue as long as there are events
        while(!myEvents.isEmpty()){

            //Get next event, update time
            a = myEvents.poll();
            currentTime = a.getTime();

            //Customer arrives
            if(a.isArrival()){
                customerArrives(currentTime);
            }
            
            //Customer Departs
            if(a.isDeparture()){
                customerDeparts(, currentTime);
            }
        }
        
        //Print Results
        calcResults();
    }