public Hashtable<String, String> login(JFrame frame) {
    Hashtable<String, String> logininformation = new Hashtable<String, String>();

    JPanel panel = new JPanel(new BorderLayout(5, 5));

    JPanel label = new JPanel(new GridLayout(0, 1, 2, 2));
    label.add(new JLabel("E-Mail", SwingConstants.RIGHT));
    label.add(new JLabel("Password", SwingConstants.RIGHT));
    panel.add(label, BorderLayout.WEST);

    JPanel controls = new JPanel(new GridLayout(0, 1, 2, 2));
    JTextField username = new JTextField();
    controls.add(username);
    JPasswordField password = new JPasswordField();
    controls.add(password);
    panel.add(controls, BorderLayout.CENTER);

    JOptionPane.showMessageDialog(frame, panel, "login", JOptionPane.QUESTION_MESSAGE);

    logininformation.put("user", username.getText());
    logininformation.put("pass", new String(password.getPassword()));
    return logininformation;
}

JOptionPane.showConfirmDialog(
            frame, panel, "login", JOptionPane.OK_CANCEL_OPTION);

jButton1.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e){
        frameName.dispose();
    }
});