import javax.swing.*;

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

        JFrame vindu = new JFrame("Testing JButtonGrid");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButtonGrid grid = new JButtonGrid(10, 18, 30);

        vindu.add(grid);

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