Looping back to start after each switch-case

I'm looking for a way to return to the 'menu' after each case has been completed and to only exit/close the program when quit is selected. I presume a while loop would be used but I am having trouble returning to the menu and keeping all input and progress so far without restarting the program. Here's my code so far;

import java.util.Scanner;

public class User2 {
private static Scanner in;

public static void main(String[] args) {

    in = new Scanner(System.in);

    int userChoice;

    boolean quit = false;
    String firstName = null;
    String secondName = null;
    String email = null;
    String username = null;
    String password = null;

    do {


        System.out.println("1. Create Account");
        System.out.println("2. Login");
        System.out.println("3. Quit");
        userChoice = Integer.parseInt(in.nextLine());

        switch (userChoice) {

        case 1:
            System.out.print("Enter your first name: ");
            firstName = in.nextLine();
            System.out.println("Enter your second name:");
            secondName = in.nextLine();
            System.out.println("Enter your email address:");
            email = in.nextLine();
            System.out.println("Enter chosen username:");
            username = in.nextLine();
            System.out.println("Enter chosen password:");
            password = in.nextLine();

            break;

        case 2:

            String enteredUsername;
            String enteredPassword;

            System.out.print("Enter Username:");
            enteredUsername = in.nextLine();
            System.out.print("Enter Password:");
            enteredPassword = in.nextLine();
            if (username != null && password != null
                    && enteredUsername == username
                    && enteredPassword == password)
                System.out.println("Login Successfull!");
            else
                System.out.println("Login Failed!");

            break;

        case 3:
            quit = true;
            break;
        default:
            System.out.println("Wrong choice.");

        }

        System.out.println();

    } while (!quit);

    System.out.println("Bye!");

  }
}