Lesson 07

src/main/java/lessons/lesson07/Flight/flightInfo.txt

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+1
+Economy
+PAID
+2025-10-15T12:00:52.546690
+Feruz
+2
+Economy
+PAID
+2025-10-15T12:01:07.354018400
+dfe
+3
+Economy
+BOOKED
+2025-10-15T12:01:44.079517200
+Helen
+4
+Economy
+FREE
+null
+No passenger!
+5
+Economy
+FREE
+null
+No passenger!
+6
+Economy
+FREE
+null
+No passenger!
+7
+Economy
+FREE
+null
+No passenger!
+8
+Economy
+FREE
+null
+No passenger!
+9
+Economy
+FREE
+null
+No passenger!
+10
+Economy
+FREE
+null
+No passenger!

src/main/java/lessons/lesson07/Passenger.java

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+package lessons.lesson07;
+
+public class Passenger extends Person {
+    private int seatNumber;
+    private String flightClass;
+
+    public Passenger(String fio, int id, int seatNumber, String flightClass) {
+        super(fio, id);
+        this.seatNumber = seatNumber;
+        this.flightClass = flightClass;
+    }
+
+    public int getSeatNumber() {
+        return seatNumber;
+    }
+
+    public String getFlightClass() {
+        return flightClass;
+    }
+}

src/main/java/lessons/lesson07/Person.java

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+package lessons.lesson07;
+
+public abstract class Person {
+    private String fio;
+    private int id;
+
+    public Person(String fio, int id) {
+        this.fio = fio;
+        this.id = id;
+    }
+
+    public String getFio() {
+        return fio;
+    }
+
+    public void setFio(String fio) {
+        this.fio = fio;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" +
+                "fio='" + fio + '\'' +
+                ", id=" + id +
+                '}';
+    }
+}

src/main/java/lessons/lesson07/ReservationSystem.java

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+package lessons.lesson07;
+
+import java.io.*;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+
+public class ReservationSystem {
+    private int totalSeats;
+    private String destination;
+    private LocalDateTime flightDateTime;
+    protected ArrayList<SeatReservation> seatReservations = new ArrayList<>();
+
+    public ReservationSystem(int totalSeats, String destination, LocalDateTime flightDateTime) {
+        this.totalSeats = totalSeats;
+        this.destination = destination;
+        this.flightDateTime = flightDateTime;
+
+        // создает пустые места
+        for (int i = 1; i <= totalSeats; i++) {
+            seatReservations.add(new SeatReservation(i, "Economy", false, null));
+        }
+    }
+
+    public SeatReservation findSeat(int seatNumber) {
+        for (SeatReservation s : seatReservations) {
+            if (seatNumber == s.getSeatNumber()) {
+                return s;
+            }
+        }
+        return null;
+    }
+
+    public void bookSeat(int seatNumber, Passenger passenger) {
+        SeatReservation seat = findSeat(seatNumber);
+        if (seat != null) {
+            if (seat.status.equals("FREE")) {
+                seat.passenger = passenger;
+                seat.book();
+            } else {
+                System.out.println("Not available! Current status: " + seat.status);
+            }
+        } else {
+            System.out.println("There is no such seat number!");
+        }
+    }
+
+    public void cancelSeat(int seatNumber) {
+        SeatReservation seat = findSeat(seatNumber);
+        if (seat != null) {
+            if (!seat.status.equals("FREE")) {
+                seat.cancel();
+            } else {
+                System.out.println("This seat is not booked yet!");
+            }
+        } else {
+            System.out.println("There is no such seat!");
+        }
+    }
+
+    public void payForSeat(int seatNumber) {
+        SeatReservation seat = findSeat(seatNumber);
+        if (seat == null) {
+            System.out.println("There is no such seat!");
+            return;
+        }
+
+        if (seat.status.equals("BOOKED")) {
+            seat.status = "PAID";
+            System.out.println("Payment successful. Seat " + seatNumber + " is now paid!");
+        } else if (seat.status.equals("PAID")) {
+            System.out.println("This seat is already paid!");
+        } else {
+            System.out.println("Cannot pay for this seat! It’s not booked yet.");
+        }
+    }
+
+    public void showAllSeats() {
+        System.out.println("=== All Seats in the Airplane ===");
+        for (SeatReservation seat : seatReservations) {
+            if (seat.isExpired()) {
+                seat.cancel();
+                System.out.println("Seat " + seat.getSeatNumber() + " — booking expired and freed automatically!");
+            }
+
+            String status = seat.status;
+            String fio = (seat.passenger != null) ? seat.passenger.getFio() : "No passenger";
+            System.out.printf("Seat %2d | Class: %-8s | Status: %-10s | %s%n",
+                    seat.getSeatNumber(), seat.getFlightClass(), status, fio);
+        }
+        System.out.println("================================");
+    }
+
+    public void saveToFile() {
+        File directory = new File("Flight");
+        File file = new File(directory, "flightInfo.txt");
+        try {
+            directory.mkdir();
+            file.createNewFile();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        try (FileWriter writer = new FileWriter(file, false)) {
+            for (SeatReservation s : seatReservations) {
+                writer.write(s.getSeatNumber() + "\n");
+                writer.write(s.getFlightClass() + "\n");
+                writer.write(s.status + "\n");
+                writer.write((s.bookingTime != null ? s.bookingTime.toString() : "null") + "\n");
+                writer.write((s.getPassenger() != null ? s.getPassenger().getFio() : "No passenger!") + "\n");
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void loadFromFile() {
+        File directory = new File("src/main/java/lessons/lesson06/Flight");
+        File file = new File(directory, "flightInfo.txt");
+        if (!file.exists()) return;
+
+        try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+            String line;
+            seatReservations.clear();
+
+            while ((line = br.readLine()) != null) {
+                int seatNumber = Integer.parseInt(line);
+                String flightClass = br.readLine();
+                String status = br.readLine();
+                String bookingTimeStr = br.readLine();
+                String passengerFio = br.readLine();
+
+                Passenger passenger = null;
+                if (!passengerFio.equals("No passenger!")) {
+                    passenger = new Passenger(passengerFio, 0, seatNumber, flightClass);
+                }
+
+                SeatReservation seat = new SeatReservation(seatNumber, flightClass, false, passenger);
+                seat.status = status;
+                if (!"null".equals(bookingTimeStr)) {
+                    seat.bookingTime = LocalDateTime.parse(bookingTimeStr);
+                }
+
+                seatReservations.add(seat);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
+
+
+

src/main/java/lessons/lesson07/Reserve.java

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+package lessons.lesson07;
+
+import java.time.LocalDateTime;
+
+public abstract class Reserve {
+    protected int seatNumber;
+    protected String flightClass;
+    protected boolean isReserved;
+    protected Passenger passenger;
+    protected String status = "FREE";
+    protected LocalDateTime bookingTime;
+
+    public Reserve(int seatNumber, String flightClass, boolean isReserved, Passenger passenger) {
+        this.seatNumber = seatNumber;
+        this.flightClass = flightClass;
+        this.isReserved = isReserved;
+        this.passenger = passenger;
+        this.status = isReserved ? "BOOKED" : "FREE";
+    }
+
+    public abstract void book();
+    public abstract void cancel();
+    public abstract String getInfo();
+
+    public boolean isExpired() {
+        if (status.equals("BOOKED") && bookingTime != null) {
+            return bookingTime.plusMinutes(24).isBefore(LocalDateTime.now());
+        }
+        return false;
+    }
+
+    public LocalDateTime getBookingTime() {
+        return bookingTime;
+    }
+
+    public void setBookingTime(LocalDateTime bookingTime) {
+        this.bookingTime = bookingTime;
+    }
+
+    public int getSeatNumber() {
+        return seatNumber;
+    }
+
+    public String getFlightClass() {
+        return flightClass;
+    }
+
+    public Passenger getPassenger() {
+        return passenger;
+    }
+}
+
+