?class ControlPanel extends JPanel {
??JCheckBox checkBox = new JCheckBox("UIResource");

??JRadioButton motifButton = new JRadioButton("Motif"),
????windowsButton = new JRadioButton("Windows"),
????metalButton = new JRadioButton("Metal");

??public ControlPanel() {
???ActionListener listener = new RadioHandler();
???ButtonGroup group = new ButtonGroup();

???group.add(motifButton);
???group.add(windowsButton);
???group.add(metalButton);

???motifButton.addActionListener(listener);
???windowsButton.addActionListener(listener);
???metalButton.addActionListener(listener);

???add(motifButton);
???add(windowsButton);
???add(metalButton);
??}

??class RadioHandler implements ActionListener {
???public void actionPerformed(ActionEvent e) {
????JRadioButton src = (JRadioButton) e.getSource();

????try {
?????if (src == motifButton)
??????UIManager.setLookAndFeel("com.sun.java.swing.plaf."
????????+ "motif.MotifLookAndFeel");

?????else if (src == windowsButton)
??????UIManager.setLookAndFeel("com.sun.java.swing.plaf."
????????+ "windows.WindowsLookAndFeel");

?????else if (src == metalButton)
??????UIManager.setLookAndFeel("javax.swing.plaf.metal."
????????+ "MetalLookAndFeel");
????} catch (Exception ex) {
?????ex.printStackTrace();
????}
????SwingUtilities.updateComponentTreeUI(getContentPane());
???}
??}
?}