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

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

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

    JButton knapp1 = new JButton("Den grå knappen");
    knapp1.setBackground(Color.LIGHT_GRAY);
    panel.add(knapp1);

    JButton knapp2 = new JButton("Den gule knappen");
    knapp2.setBackground(new Color(255,255,0)/*gul*/);
    panel.add(knapp2);

    JButton knapp3 = new JButton("Knappen med rød tekst");
    knapp3.setForeground(Color.RED);
    panel.add(knapp3);

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