JToggleButton - Change background when in pressed form

Question

Could anyone please tell me how to change the colour of a JToggleButton when in a pressed state?
I've got a dew number of JToggleButton in a row but its a little difficult which button is in a pressed state so I thought of changing the colour when pressed. I tried changing the Look and Feel but it doesnt make much improvements.
Any other suggestion?
Thanks

Answer 1

Say it with icons?
import java.awt.*;
import java.net.*;
import javax.swing.*;
public class FrameExample  {
    public static void main(String[] args) throws MalformedURLException {
        Icon checked = new ImageIcon(new URL("http://www.oracle.com/technology/tech/blaf/specs/icons/statusindicators/completeind_status.gif"));
        Icon empty = new EmptyIcon();
        JPanel contentPane = new JPanel();
        for(int i=0; i<8; ++i) {
            JToggleButton btn = new JToggleButton("button #" + i);
            btn.setSelectedIcon(checked);
            btn.setIcon(empty);
            contentPane.add(btn);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(contentPane);
        f.pack();
        f.setVisible(true);
class EmptyIcon implements Icon {
    public int getIconHeight() {return 16;}
    public int getIconWidth() {return 16;}
    public void paintIcon(Component c, Graphics g,int x,int y) {}
}