import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class NewGui {
    NewGui() {

    // podstawowa deklaracja okna
    JFrame window = new JFrame("First GUI app");
    window.setSize(400,500);
    window.setLayout(new BorderLayout());

    // panel gorny
    JPanel northPanel = new JPanel();
    JButton red = new JButton("RED");
    red.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e) {
            northPanel.setBackground(Color.black);
            repaint();
        }
    });
    JButton blue = new JButton("BLUE");
    northPanel.add(red);
    northPanel.add(blue);
    window.add(northPanel, BorderLayout.NORTH);

    // panel srodkowy
    JPanel centerPanel = new JPanel();
    window.add(centerPanel, BorderLayout.CENTER);

    // panel dolny
    JPanel southPanel = new JPanel();
    JButton text1 = new JButton("tekst pierwszy");
    JButton text2 = new JButton("tekst drugi");
    southPanel.add(text1);
    southPanel.add(text2);
    window.add(southPanel, BorderLayout.SOUTH);

    // podstawowa deklaracja widocznosci i zamkniecia
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setVisible(true);
    }


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



    }
}