public class Patron {
    public int     age;
    public Ticket  ticket;
    
    public Patron(int anAge) {
        age = anAge;
        ticket = null;
    }
    
    public String toString() {
        String result = age + "yr old patron with";
        if (ticket == null)
            return result + "out a ticket";
        return result + " a ticket for theatre " + ticket.theatreID;
    }

    // Determine and return the price that the Patron should pay for a ticket
    public float ticketPrice() {
        if (age <= 12)
            return Ticket.REG_CHILD_PRICE;
        else if (age >= 65)
            return Ticket.REG_SENIOR_PRICE;
        return Ticket.REG_ADULT_PRICE;
    }
    
    // Simulate this patron buying a ticket at a theatre
    public void buyTicket(Theatre aTheatre) {
        if (aTheatre.seatsSold < aTheatre.capacity) {
            ticket = new Ticket(aTheatre.id);      // make and store the ticket
            
            // Now increase the earnings and add 1 to the count of seats sold
            aTheatre.movieEarnings += ticketPrice();
            aTheatre.seatsSold++;
        }
    }
    
    // Simulate this patron returning a ticket for a theatre
    public void returnTicket(Theatre aTheatre) {
        if ((ticket != null) && 
            (ticket.theatreID == aTheatre.id)) {
            
            ticket = null;
            
            // Now decrease the earnings and deduct 1 from the count
            aTheatre.movieEarnings -= ticketPrice();
            aTheatre.seatsSold--; 
        }
    }
}