Yahoo : UserLogin

import javax.swing.*;

public class UserLogin {
    public static void main(String[] args) {
        String[] usernames = { "x", "jimmy12", "john05" , "lauren01", "katie90"};
        String[] passwords = { "x", "mets7654", "bass1276", "beauty0000", "password2176"};

        boolean done = false;
        do {
            String input = JOptionPane.showInputDialog("(l)ogin to account\n(q)uit program");
            if (input.equalsIgnoreCase("q")) {
                done = true;
            } else {
                String username = JOptionPane.showInputDialog("Enter username");
                String password = JOptionPane.showInputDialog("Enter password");
                String message = "Invalid try again";

                for(int i = 0; i < usernames.length; i++) {
                    if (usernames[i].equalsIgnoreCase(username)) {
                        if (passwords[i].equals(password)) {
                            message = "you are logged in";
                            done = true;
                            break;
                        }
                    }
                }

                JOptionPane.showMessageDialog(null, message);
            }
        } while (!done);
    }
}