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

public class FocusCycleRootTest
{
    public static void main(String[] args)
    {
        JFrame window = new JFrame("Test");
        window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        
        JPanel rootPanel = new JPanel();
        rootPanel.setLayout(new BorderLayout());
        
        JPanel formPanel = new JPanel();
        formPanel.setFocusTraversalPolicy(new LayoutFocusTraversalPolicy());
        formPanel.setFocusCycleRoot(true);
        
        JRadioButton option1 = new JRadioButton("Option 1", true);
        JRadioButton option2 = new JRadioButton("Option 2");
        
        ButtonGroup radioButtonGroup = new ButtonGroup();
        radioButtonGroup.add(option1);
        radioButtonGroup.add(option2);
        
        formPanel.add(option1);
        formPanel.add(option2);
        formPanel.add(new JTextField("Another focusable component"));
        
        rootPanel.add(formPanel, BorderLayout.CENTER);
        
        JButton okButton = new JButton("OK");
        rootPanel.add(okButton, BorderLayout.SOUTH);
        
        window.add(rootPanel);
        window.pack();
        window.setVisible(true);
    }
}