Java

Can you name some Java literature that you are familiar with or have studied?

In what situations is it recommended to use the CopyOnWriteArrayList data structure in a multithreaded environment?

How to merge two different branches in Git?

What makes integration tests less preferable for you?

What is the difference between map and flatMap operations?

What access modifiers do fields and methods have in default interfaces?

What is the data storage format JSON?

Read the code and highlight errors. /** * A client with a purchased ticket can choose a specific seat for an additional fee. * The base price of seats is determined by tariffs (external service). * For clients with certain tariffs (PREMIUM, ULTRA), a discount is applied at payment. * When booking, an invoice is issued to the client for payment. Payment management is handled by a third-party service. */ @Service public class SeatBookingService { @Autowired private SeatBookingRepository seatBookingRepository; @Autowired private TicketRepository ticketRepository; @Autowired private TariffClient tariffClient; @Autowired private CustomerClient customerClient; @Autowired private PaymentClient paymentClient; /** * Booking. * @param seatCode seat code (e.g., 19A) * @param ticketId ticket ID */ @Transactional public void bookSeat(String seatCode, UUID ticketId) { var ticket = ticketRepository.findById(ticketId); //book var seatBooking = new SeatBooking(seatCode, ticket.get().getFlightId(), ticketId, BookingStatus.BOOKED); seatBookingRepository.save(seatBooking); //find base tariff for the selected seat on the plane var basePrice = tariffClient.getBasePrice(ticket.get().getPlaneModel(), seatCode); //find customer data Long userId = (Long) SecurityContextHolder.getContext().getAuthentication().getPrincipal(); var userData = customerClient.getCustomer(userId); System.out.println("User found " + userData.getFio() + " document number " + userData.getDocument()); var price = basePrice; if (userData.getTariff() == "PREMIUM") { //50% discount price = basePrice * 0.5d; } if (userData.getTariff() == "ULTRA") { //20% discount price = basePrice * 0.8d; } var invoice = new Invoice(price, ticketId, userId); //issue invoice paymentClient.sendInvoice(invoice); System.out.println("Invoice issued"); } @Data @Table("seat_booking") public class SeatBooking { @Column private String seatCode; @Column private UUID flightId; @Column private UUID ticketId; @Column private BookingStatus status; } public enum BookingStatus { BOOKED, PAID; }

Senior

Т-Банк

Can you name the main analytical functions used in SQL for data analysis?

Junior — Middle

Транснефть

What is the difference between the dependency and dependencyManagement sections in a Maven configuration file?

Junior — Middle

IT One

Why are ArrayList and array the fundamental data structures in Java?

How to call a stored procedure in Java?

Can you explain how data deduplication works and what it is used for?

How to create a controller in Spring?

How to register a JDBC driver?

How do loops in Java differ?

Have you participated in setting up or working with the stage environment for testing or deployment?

Describe the general practical principles of working with JavaServer Pages (JSP).

How do you use dependency injection in your projects?

How is automatic resource closing implemented using the try-with-resources construct?