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

class Bakgrunn {
    public static void main (String[] arg) {
        try {
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) { System.exit(1); }

        JFrame vindu = new JFrame("Farger");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        vindu.add(panel);

        JButton knapp1 = new JButton("Den ene knappen");
        knapp1.setOpaque(true);
        knapp1.setBackground(Color.LIGHT_GRAY);
        knapp1.setFont(new Font(Font.MONOSPACED, Font.BOLD, 30));
        panel.add(knapp1);

        JButton knapp2 = new JButton("Den andre knappen");
        knapp2.setOpaque(true);
        knapp2.setBackground(new Color(255,255,0)/*gul*/);
        knapp2.setFont(new Font(Font.MONOSPACED, Font.BOLD, 30));
        panel.add(knapp2);

        vindu.pack();  vindu.setVisible(true);
    }
}