public class Main extends JFrame {

    JFrame frame = new JFrame ("Aaaaa");
    JButton button_name = new JButton("Wpisz imie");
    JFrame frame_name = new JFrame ("Podaj swoje imię");
    Point center =
            GraphicsEnvironment.getLocalGraphicsEnvironment().getCenterPoint(); //Get center of screen
    ButtonListener bl = new ButtonListener();

    /**************************************************************************/
    //Imię
    String name = new String();
    JButton button_get_name = new JButton("OK");
    JTextField field_name = new JTextField(15);
    JPanel panel_name = new JPanel();
    /**************************************************************************/

    public Main(){
        button_name.addActionListener(bl);
        button_get_name.addActionListener(bl);

        JFrame.setDefaultLookAndFeelDecorated(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new GridLayout(2,2));

        frame.add(new JLabel (name));
        frame.add(button_name);
        frame.add(new JLabel ("HEHEHE"));

        frame.setBounds(center.x - 400 / 2, center.y - 400 / 2, 400, 400);      //Set window in a center of screen

        frame.setVisible(true);

    }

    /**
     * @param args the command line arguments
     */

    public static void main(String[] args) {
        new Main();
    }

    public class ButtonListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == button_name){
                frame.dispose();
                frame_name.setBounds(center.x - 100 / 2, center.y - 100 / 2, 100, 100);
                frame_name.setLayout(new GridLayout(2,1));
                frame_name.add(field_name);
                frame_name.add(button_get_name);
                frame_name.setVisible(true);
            }
            if (e.getSource() == button_get_name){
                name = field_name.getText();
                frame_name.dispose();
                frame.setVisible(true);
            }