CareerCup

public class Station {
    private int stationID;
    private String stationName;

    // Getters and Setters
}

public class Train {
    private int trainID;
    private String trainName;
    private Map<Station, Double> trainStationsWithFares;

    public Train(int ID, String trainName, Station[] stations) {
        // Initialize ID and name and create a hashmap with all stations and
        // zero fare initially for all stations.
        ....
        ....
        trainStationsWithFares = new HashMap<Station, Double>();
        for(Station s : stations) trainStationsWithFares.put(s, new Double(0.0));
    }

    // Getters and Setters (including methods to add new stations with fares and
    // update fares of existing stations
}

public class TicketDetails {
    private Train t;
    private Station from;
    private Station to;

    // Getters and Setters
}

public class TrainTicket {
    private int ID;
    private TicketDetails ticketDetails;
    private Double fare;

    public TrainTicket(TicketDetails ticketDetails)
        throws InvalidTrainException, InvalidFromStationException,
            InvalidToStationException {
        ...
        calculateFare();
    }

    // Calculates fare based on Train and from and to Stations and taxes, etc.
    private void calculateFare() {
        this.fare = ...
    }
}

// Assuming card payment only for online reservation system for simplicity.
// Design can be modified and enhanced suitably.
public class PaymentDetails {
    private String cardNumber;
    private String cardExpirationMonth;
    private String cardExpirationYear;
    private String cardCVV;

    // Getters and Setters
}

public abstract class ReservationSystem {
    // Purchase train ticket by providing ticket details and payment details.
    public abstract TrainTicket purchaseTicket(TicketDetails ticketDetails,
        PaymentDetails paymentDetails);    
    // Cancel existing train ticket by providing ticket reference and payment details
    // for cancellation charges.
    public abstract boolean cancelTicket(TrainTicket tt, PaymentDetails details);
    // Modify existing train ticket by providing existing ticket reference,new ticket
    // details and payment details for any additional charge or modify charges.
    public abstract TrainTicket modifyTicket(TrainTicket existingTicket,
        TicketDetails newTicketDetails, PaymentDetails paymentDetails) {
    }
}

Other classes/methods can be added to further enhance the design. Please share your thoughts, comments and suggestions. Thank you.

it looks good other than TrainTicket class should be like


public class TrainTicket {
private int ID;
private TicketDetails ticketDetails;
private Double fare;
private Passenger passenger;
private SeatDetail seatDetail;
}

and there should be one more class

public class Passenger {
private String Name;
private int id;
private int age;
private static final enum { Male, Female } gender;
}

What about the availabilty of sets, capacity and current load?

I think that should be maintained as part of Train. Any suggestions

How will it take care of searching and fetching available trains between two stations.