import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.awt.Dimension;
import java.io.*;

public class odtwarzacz {

    public static void main (String[] args) {
        JFrame oknoGlowne = new JFrame("Okno glowne programu");
        oknoGlowne.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        oknoGlowne.setPreferredSize(new Dimension(600, 400));
        oknoGlowne.setResizable(false);
        oknoGlowne.setVisible(true);
        oknoGlowne.pack();
        oknoGlowne.setLayout(new BorderLayout());

        JPanel panel = new JPanel(new GridBagLayout());
        JButton b1 = new JButton("Przycisk PLAY");
        JButton b2 = new JButton("Przycisk PAUZA");
        JButton b3 = new JButton("Przycisk STOP");
        GridBagConstraints layout = new GridBagConstraints();
        layout.insets = new Insets(0, 10, 5, 0);
        layout.anchor = GridBagConstraints.SOUTH;
        layout.weighty = 1;

        panel.add(b1, layout);
        panel.add(b2, layout);
        panel.add(b3, layout);
        oknoGlowne.add(panel, BorderLayout.CENTER);
    }
}