Amazon Interview Question for SDE-2s


Country: India
Interview Type: In-Person




Comment hidden because of low score. Click to expand.
1
of 1 vote

I thought of 4 immediate classes:-
---------------------------------

public class AirPlane
{
    // Attributes
    public Integer plane_ID;
    public String airLine;
	
	//some getter,setter
}

public class Flight
{
    // Attributes
       private Integer flight_ID;
       private String from_location;
       private String to_location;
       private TimeStamp departureTime;
       private TimeStamp arrivalTime;
       private String description;
       private Integer plane_FKey; //mapped to plane_ID

    // Operations
    public  TimeStamp getArrivalTime()   {...}
    public  TimeStamp getDepartureTime()  {...}
}


public class Arrivals
{
    // Attributes
    private List<Flight> arrivingFlights;
   
    // Operations
    private  void displayFlights()  {...}
} 

public class Departures
{
    // Attributes
    private List<Flight> departingFlights;
   
    // Operations
    private  void displayFlights()  {...}
}

Who produces the arriving . departure feed ?
Feed pushed to a MQ or what?
Then who has responsibility to consume MQ messeges? What are next classes till updation of display board ?
Any Controller or Manager class - like DashBoard / DashboardController / FlightMonitorController ? What will be their responsibilities ?
What else I'm missing and what correction needed more ?

- AD August 04, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
1
of 1 vote

public class Aircraft
{
// Attribute
private String airLine;
// more attributes like model, no of seats etc
}

public class Flight
{
// Attributes
private Location fromLocation;
private Location toLocation;
private TimeStamp expectedDepartureTime;
private TimeStamp expectedArrivalTime;
private CrewInfo crewDetails;
private PassengerInfo passengerDetails;
private TerminalInfo terminalInfo; // this will have info like check-in counter, gate etc
private FlightStatus flightStatus; // this will have actual arrival, departure time, also status of flight
}


public class FIS
{
// Attributes
private List<Flight> arrivalFlights;
private List<Flight> departureFlights;

// Operations
private List<Flight> getArrivalFlights(Location location);
private List<Flight> getDepartureFlights(Location location);
}

public class DisplayManager {

private FIS fis;
private Display display;
public void displayArrivalFlights(){
Location location = LocManager.getCurrentLocation();
List<Flight> flights = fis.getArrivalFlights(location);
display.display(flights);
}
}
}}}
// There can be various display classes based on how you want to display it
// We do not need to bother about MQ, who populates the data etc, as the question clearly specifies
// It is not the responsibility of the display system

- 4d August 07, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

list should be synchronized
observer should be there on list as soon as it gets updated
I guess caching should not present

- Titan August 08, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

But I feel to some extent consuming the feed-update is a responsibiity of some class. What your thought ?

- AD August 21, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Please delete the abc, ann,abc comments

- AD August 21, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

abc

- anon August 07, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

aaa

- ann August 07, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

abc

- abc August 07, 2017 | Flag Reply


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