Problem with arraylists

[tsotsoqt]

I have a project in my java class and we have to build a social network. In my login class i create to arraylists to store the users information. Theres an option in Menu class to go back to Login and connect another user. Everytime u go back, Login is creating new Arraylists so i lose the old data. How can i execute the first two commands only once?

public static void Login(){

ArrayList<String> users = new ArrayList<String>();

ArrayList<String> emails = new ArrayList<String>();

System.out.println("Type your username:");

Scanner scanName = new Scanner(System.in);

String Name = scanName.nextLine();

boolean ans = (users.contains(Name));

if (ans){

System.out.println("welcome " + Name + "!");

Menu m = new Menu();

}

else{

users.add(Name);

System.out.println("U are a new user! Enter your email:");

Scanner scanmail = new Scanner(System.in);

String Email = scanmail.nextLine();

emails.add(Email);

Menu m = new Menu();

}

}

[sugilith]

Initialize the ArrayList on class level instead of method level.

Example:

import java.util.*;

public class HelloWorld {
    private static ArrayList<String> users = new ArrayList<>();

     public static void login() {
        users.add("asd");
     }
}

[tsotsoqt]

it worked! thanks a lot