How do I make the method print only one message to me

Question

I have this part of method here:

 System.out.println("Do you have promo code (yes / no ): ");
    String yesNo = scanner.nextLine();

    if (yesNo.contains("yes")) {
        System.out.println("Enter promo code: ");
        String promoCode = scanner.nextLine();
        for (Flights flight : flights) {
            if (promoCode.equals(flight.getPromoCode())) {
                System.out.println("Your promo code is valid!");
            } else if (yesNo.contains("no")) {
                System.out.println("Your dont have promo code!");
            } else {
                System.out.println("Your promo code is not valid, 6 for options");
            }
        }
    }
}
}

Program ask me this, that is fine:

System.out.println("Do you have promo code (yes / no ): ");
String yesNo = scanner.nextLine();

If i type yes program print me this:

 if (yesNo.contains("yes")) {
    System.out.println("Enter promo code: ");
    String promoCode = scanner.nextLine();

That is fine, but if I enter valid promo code, program print me this:

Your promo code is valid!
Your promo code is not valid, 6 for options
Your promo code is not valid, 6 for options
Your promo code is not valid, 6 for options

Also if i type no, this part of code isnt working:

      } else if (yesNo.contains("no")) {
                System.out.println("Your dont have promo code!");

I guess it's up to the forr loop, but I can't think of a way to fix this part of the code.

---

Requires code to run it in your development environment.

Class flights:

package com.cv.entity.flights;

public class Flights {

private String from;
private String to;
private double economyClassPrice;
private double businessClassPrice;
private double firstCassPrice;
private int flightId;
private String promoCode;

 public Flights() {
}

public Flights(String from, String to, double economyClassPrice, double businessClassPrice, double firstCassPrice, int flightId, String promoCode) {
    this.from = from;
    this.to = to;
    this.economyClassPrice = economyClassPrice;
    this.businessClassPrice = businessClassPrice;
    this.firstCassPrice = firstCassPrice;
    this.flightId = flightId;
    this.promoCode = promoCode;
}

public String getFrom() {
    return from;
}

public void setFrom(String from) {
    this.from = from;
}

public String getTo() {
    return to;
}

public void setTo(String to) {
    this.to = to;
}

public double getEconomyClassPrice() {
    return economyClassPrice;
}

public void setEconomyClassPrice(double economyClassPrice) {
    this.economyClassPrice = economyClassPrice;
}

public double getBusinessClassPrice() {
    return businessClassPrice;
}

public void setBusinessClassPrice(double businessClassPrice) {
    this.businessClassPrice = businessClassPrice;
}

public double getFirstCassPrice() {
    return firstCassPrice;
}

public void setFirstCassPrice(double firstCassPrice) {
    this.firstCassPrice = firstCassPrice;
}

public int getFlightId() {
    return flightId;
}

public void setFlightId(int flightId) {
    this.flightId = flightId;
}

public String getPromoCode() {
    return promoCode;
}

public void setPromoCode(String promoCode) {
    this.promoCode = promoCode;
}

@Override
public String toString() {
    return "*FLIGHTS* " +
            "Flight ID: " + flightId +
            ", From: " + from + '\'' +
            ", To: " + to + '\'' +
            ", Economy class price: " + economyClassPrice + "$" +
            ", Business class price: " + businessClassPrice + "$" +
            ", First class price: " + firstCassPrice + "$" +
            ", Promo code: " + promoCode;

}

}

Class passengers:

package com.cv.entity.passengers;


import java.util.Scanner;

public class Passengers {

    private final Scanner scanner = new Scanner(System.in);

    private String name;
    private String lastName;
    private String email;
    private double balance;
    private boolean isVip;
    private String promoCode;

    public Passengers() {
    }

    public Passengers(String name, String lastName, String email, double balance, boolean isVip, String promoCode) {
        this.name = name;
        this.lastName = lastName;
        this.email = email;
        this.balance = balance;
        this.isVip = isVip;
        this.promoCode = promoCode;
    }

    public String getName() {
        return name;
    }

    //setter validation for name
    public void setName(String name) {
        while (!name.matches("[a-zA-Z]+")) {
            System.err.println("Invalid Entry (" + name + ")! Only letters for name!");
            name = scanner.nextLine();
        }
        this.name = name;
    }

    public String getLastName() {
        return lastName;
    }

    //setter validation for last name
    public void setLastName(String lastName) {
        while (!lastName.matches("[a-zA-Z]+")) {
            System.err.println("Invalid Entry (" + lastName + ")! Only letters for last name!");
            lastName = scanner.nextLine();
        }
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }


    //setter validation for email
    public void setEmail(String email) {
        while (!email.matches("^(.+)@(.+)$")) {
            System.err.println("Invalid Entry (" + email + ")! Try again!");
            email = scanner.nextLine();
        }
        this.email = email;
    }


    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public boolean isVip() {
        return isVip;
    }

    public void setVip(boolean vip) {
        isVip = vip;
    }

    public String getPromoCode() {
        return promoCode;
    }

    public void setPromoCode(String promoCode) {
        this.promoCode = promoCode;
    }

    @Override
    public String toString() {
        return "*PASSENGERS* " +
                "Name: " + name + '\'' +
                ", Last name: " + lastName + '\'' +
                ", Email: " + email + '\'' +
                ", Balance: " + balance +
                ", Is vip: " + isVip;
    }

}

Interface PassengerController

    package com.cv.entity.passengers;

import com.cv.entity.flights.Flights;

import java.lang.reflect.Array;
import java.util.ArrayList;

public interface PassengersController {

    public void addNewPassenger(ArrayList<Passengers> passengersList);
    public void reserveFlight(ArrayList<Flights> flights);
}

Class PassengerControllerImpl:

    package com.cv.entity.passengers;

import com.cv.entity.flights.Flights;
import com.sun.org.apache.xerces.internal.impl.xpath.regex.BMPattern;

import java.util.ArrayList;
import java.util.Scanner;

public class PassengersControllerImpl implements PassengersController {

    final Scanner scanner = new Scanner(System.in);
    final Passengers passengers = new Passengers();

    //method for adding new passengers in array list while program is running
    @Override
    public void addNewPassenger(ArrayList<Passengers> passengersList) {

        System.out.println("Creating new passenger!");

        System.out.print("Add name of passenger: ");
        passengers.setName(scanner.nextLine());

        System.out.print("Add last name of passenger: ");
        passengers.setLastName(scanner.nextLine());

        System.out.print("Add email of passenger: ");
        passengers.setEmail(scanner.nextLine());

        System.out.print("Add balance of passenger: ");
        passengers.setBalance(scanner.nextDouble());

        System.out.print("Is passenger vip? (true or false): ");
        passengers.setVip(scanner.nextBoolean());

        System.out.println("You added a new passenger!");

        //adding passengers into array list
        passengersList.add(passengers);
    }

    //the method by which the user reserves a flight
    @Override
    public void reserveFlight(ArrayList<Flights> flights) {

        System.out.println("Enter ID of flight to reserve it");

        int userChoice = scanner.nextInt();
        scanner.nextLine();

        for (Flights flight : flights) {
            if (userChoice == flight.getFlightId()) {
                System.out.println("You reserved flight to: " + flight.getTo()
                        + " from " + flight.getFrom());
            }
        }

        System.out.println("Do you have promo code (yes / no ): ");
        String yesNo = scanner.nextLine();

        if (yesNo.contains("yes")) {
            System.out.println("Enter promo code: ");
            String promoCode = scanner.nextLine();
            for (Flights flight : flights) {
                if (promoCode.equals(flight.getPromoCode())) {
                    System.out.println("Your promo code is valid!");
                } else if (yesNo.contains("no")) {
                    System.out.println("Your dont have promo code!");
                } else {
                    System.out.println("Your promo code is not valid, 6 for options");
                }
            }
        }
    }
}

Main method:

    package com.cv.demo;

import com.cv.entity.flights.Flights;
import com.cv.entity.flights.FlightsControllerImpl;
import com.cv.entity.passengers.Passengers;
import com.cv.entity.passengers.PassengersControllerImpl;

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

        //adding classes
        public static PassengersControllerImpl passengersControllerImpl = new PassengersControllerImpl();
        public static FlightsControllerImpl flightsControllerImpl = new FlightsControllerImpl();
    
        //importing scanner for user input
        final static Scanner scanner = new Scanner(System.in);
    
    
        public static void main(String[] args) {
    
            //manually adding passengers
            Passengers passenger1 = new Passengers("John", "Slavic", "john@gmail.com", 3000, true, "gC49");
            Passengers passenger2 = new Passengers("Ivan", "Ivanovic", "ivan@gmail.com", 2000, true, "asdf");
            Passengers passenger3 = new Passengers("Marko", "Markovic", "marko@gmail.com", 1800, false, "sad3");
            Passengers passenger4 = new Passengers("Jovan", "Jovanovic", "jovan@gmail.com", 100, true, "xb43");
    
            //manually adding flihts
            Flights flight1 = new Flights("Moscow", "Belgrade", 300, 600, 850, 1, "gC49");
            Flights flight2 = new Flights("Paris", "Dortmund", 250, 290, 400, 2, "soe4");
            Flights flight3 = new Flights("Podgorica", "Nis", 25, 40, 80, 3, "sx33");
            Flights flight4 = new Flights("London", "Miami", 600, 1500, 2500, 4, "zcl3");
    
            //creating array list for passengers
            ArrayList<Passengers> passengersArrayList = new ArrayList<>();
            passengersArrayList.add(passenger1);
            passengersArrayList.add(passenger2);
            passengersArrayList.add(passenger3);
            passengersArrayList.add(passenger4);
    
            //creating array list for flights
            ArrayList<Flights> flightsArrayList = new ArrayList<>();
            flightsArrayList.add(flight1);
            flightsArrayList.add(flight2);
            flightsArrayList.add(flight3);
            flightsArrayList.add(flight4);
    
    
            //program at first show menu to user
            showMenu();
    
            //switch case to allow the user to select an action
            while (true) {
                int choice = scanner.nextInt();
                scanner.nextLine();
                switch (choice) {
                    case 1:
                        for (Passengers passengers : passengersArrayList) {//printing array elements one below the other
                            System.out.println(passengers);
                        }
                        break;
                    case 2:
                        for (Flights flights : flightsArrayList) { //printing array elements one below the other
                            System.out.println(flights);
                        }
                        break;
                    case 3:
                        passengersControllerImpl.addNewPassenger(passengersArrayList); //adding a new passenger
                        break;
                    case 4:
                        flightsControllerImpl.addNewFlights(flightsArrayList); //adding a new flight
                        break;
                    case 5:
                        System.out.println("--- Available flights ---");
                        for (Flights flights : flightsArrayList) { //printing list of flight
                            System.out.println(flights);
                        }
                        passengersControllerImpl.reserveFlight(flightsArrayList);//calling method for reservation
                        break;
                    case 6:
                        showMenu(); //showing options to the user
                        break;
                    case 7:
                        return; //program shutdown
                    default:
                        System.out.println("Invalid input!");
    
                }
    
            }
    
        }
    
        public static void showMenu() { //list of user options
            System.out.println("1\t Passenger list");
            System.out.println("2\t Flight list");
            System.out.println("3\t Add new passenger");
            System.out.println("4\t Add new flight");
            System.out.println("5\t Reserve flight");
            System.out.println("6\t Show menu again");
            System.out.println("7\t Exit program");
    
    
            System.out.println("Please enter your choice: ");
        }
    }