public class Login implements ActionListener {
    String usernameVar;
    String passwordVar;

    JFrame frame = new JFrame();
    JPanel loginScreen = new JPanel();
    JLabel username = new JLabel("Username: ");
    JLabel password = new JLabel("Password");
    JTextField passwordIn = new JTextField();
    JTextField usernameIn = new JTextField();
    JButton loginButton = new JButton("Login");
    JButton subButton = new JButton("Create new account");
    Font font = new Font("", Font.PLAIN, 20);
    Font answers = new Font("", Font.PLAIN, 16);

    public Login() {
        frame.setSize(700, 500);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);

        username.setSize(200, 100);
        username.setLocation(200, 50);
        username.setFont(font);

        usernameIn.setSize(200, 20);
        usernameIn.setLocation(320, 95);
        usernameIn.setFont(answers);

        password.setSize(200, 100);
        password.setLocation(200, 150);
        password.setFont(font);

        passwordIn.setSize(200, 20);
        passwordIn.setLocation(320, 195);
        passwordIn.setFont(answers);

        loginButton.setSize(100, 40);
        loginButton.setLocation(200, 300);
        loginButton.setFont(font);
        loginButton.addActionListener(this);

        subButton.setSize(250, 40);
        subButton.setLocation(350, 300);
        subButton.setFont(font);
        subButton.addActionListener(this);

        loginScreen.setLayout(null);
        loginScreen.add(username);
        loginScreen.add(password);
        loginScreen.add(usernameIn);
        loginScreen.add(passwordIn);
        loginScreen.add(loginButton);
        loginScreen.add(subButton);

        frame.add(loginScreen);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            if (usernameIn.getText().equals(usernameVar) && passwordIn.getText().equals(passwordVar)) {
                loginScreen.setVisible(false);
                frame.add(Logged.loggedScreen);
                Logged.loggedScreen.setVisible(true);
            }
        }
        if (e.getSource() == subButton) {
            loginScreen.setVisible(false);
            frame.add(Create.subScreen);
            Create.subScreen.setVisible(true);
        }
    }

}