import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class FocusCycleSample {
public static void main(String args[]) {
JFrame frame = new JFrame("Focus Cycle Sample");
Container contentPane = frame.getContentPane();
contentPane.setLayout(new GridLayout(3,3));
for (int i = 0; i < 8; i++) {
JButton button = new JButton("" + i);
contentPane.add(button);
}
JPanel panel = new FocusCycleConstrainedJPanel();
panel.setLayout(new GridLayout(1, 3));
for (int i = 0; i < 3; i++) {
JButton button = new JButton("" + (i + 3));
panel.add(button);
}
contentPane.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
class FocusCycleConstrainedJPanel extends JPanel {
public boolean isFocusCycleRoot() {
return true;
}
}