VPR-Projekt/src/Login.java

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

public class Login {
    public void Einloggen(ArrayList<User> user, String password, String phoneNumber) {

        Scanner leser = new Scanner(System.in);

            System.out.println();
            int i = 0;

            while (true) {

                boolean error = false;
                error = isError(error, phoneNumber);

                for (User user1 : user) {
                    if (!error) {
                        if (user1.getPassword().equals(password) && user1.getPhonenumber().equals(phoneNumber))
                        {
                            System.out.println("");
                            System.out.println("\t\t\tANMELDUNG");
                            System.out.println();
                            System.out.println("Herzlich Willkommen " + user1.getNameParent1() + " und " + user1.getNameParent2() + ", Ihr Login war erfolgreich!");
                            i++;
                            break;
                        }
                        else if (!(user1.getPassword().equals(password) && user1.getPhonenumber().equals(phoneNumber)))
                        {
                            System.out.println("Login fehlgeschlagen. Versuchen Sie es erneut.");
                            System.out.println("");
                            System.out.print("Telefonnummer: ");
                            phoneNumber = leser.nextLine();
                            System.out.print("Passwort: ");
                            password = leser.nextLine();
                            break;
                        }
                    }
                }
                if (i > 0) {
                    break;
                }
            }
        }

    public boolean isError ( boolean error, String phoneNumber)
    {
    if (phoneNumber.isEmpty()) {
        error = true;
    }
        return error;
    }
}