import javax.swing.JFrame;
import java.awt.Graphics;
import java.awt.FlowLayout;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.ArrayList;

public class LoginScreen extends JPanel implements ActionListener{
    private JTextField login, password;
    private JButton  button;
    private JLabel  loginLabel, passwordLabel;
    private ArrayList<String> list = new ArrayList<String>(); // stores the proper login names

    public LoginScreen() {
        setLayout (new FlowLayout());
        login = new JTextField (20);
        password = new JTextField (20);
        button = new JButton ("Click");
        loginLabel = new JLabel ("Login");
        passwordLabel = new JLabel ("Password");
        add(loginLabel);
        add(login);
        add(passwordLabel);
        add(password);
        add (button);
        button.addActionListener(this);
    }

    // In the method below, you will write all the checks for login and password and also display messages as described in the problem
    public void actionPerformed(ActionEvent a) { 
        String text1 = login.getText();
        String text2 = password.getText();
     
    }

    // In the method below, you will check if input contains atleast one character in A-Z and 0-9
    // public boolean check(String input){ 
 
    // }

    public static void main (String args []) {
        LoginScreen ss = new LoginScreen();
        JFrame f = new JFrame ("GUI");
        f.add(ss);
        f.setSize(700, 250);
        f.setVisible (true);
        f.setResizable(false);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}