[BWiz]

I'm coding a little program that calculates the difference between an arrival time and departure time. Below is a little snippet of the app that calculates the difference:

public int DifferenceInHours(int Departure, int Arrival) {
        int difference = 0;
        if ( Departure >= Arrival ) {
            System.out.println("The times you entered seemed to be incorrect.");
            // I want to stop here...
        }
        difference = Arrival - Departure;
        return difference;
    }

Now say, if the departure time is greater than the arrival time, how would I stop the application completely from processing any further?

Thanks,
BWiz.