The Pluggable Look and Feel Architecture - The Definitive Guide to Java Swing - page 735

ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
Object source = actionEvent.getSource();
String lafClassName = null;
if (source instanceof JComboBox) {
JComboBox comboBox = (JComboBox)source;
lafClassName = (String)comboBox.getSelectedItem();
} else if (source instanceof JButton) {
lafClassName = actionEvent.getActionCommand();
}
if (lafClassName != null) {
final String finalLafClassName = lafClassName;
Runnable runnable = new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel(finalLafClassName);
SwingUtilities.updateComponentTreeUI(frame);
} catch (Exception exception) {
JOptionPane.showMessageDialog (
frame, "Can't change look and feel",
"Invalid PLAF", JOptionPane.ERROR_MESSAGE);
}
}
};
EventQueue.invokeLater(runnable);
}
}
};
UIManager.LookAndFeelInfo looks[] =
UIManager.getInstalledLookAndFeels();
DefaultComboBoxModel model = new DefaultComboBoxModel();
JComboBox comboBox = new JComboBox(model);
JPanel panel = new JPanel();
for (int i=0, n=looks.length; i<n; i++) {
JButton button = new JButton(looks[i].getName());
model.addElement(looks[i].getClassName());
button.setActionCommand(looks[i].getClassName());
button.addActionListener(actionListener);
panel.add(button);
}
comboBox.addActionListener(actionListener);