UIManager.setLookAndFeel主题切换怎么实现

Question

javax.swing.UIManager.setLookAndFeel 只能写在主方法里面，就不能实现实时切换主题了，有什么办法在不重启程序的情况下实现主题切换？

Answer 1

public class SwingHelper {
    public static JMenu createLookAndFeelMenu(final JFrame frame) {
        JMenu lafMenu = new JMenu("Look And Feel");
        final LookAndFeelInfo[] lafs = UIManager.getInstalledLookAndFeels();
        for (final LookAndFeelInfo laf : lafs) {
            JMenuItem lafItem = new JMenuItem(laf.getName());
            lafItem.addActionListener(new ActionListener() {                @Override
                public void actionPerformed(ActionEvent e) {
                    try {
                        UIManager.setLookAndFeel(laf.getClassName());
                        SwingUtilities.updateComponentTreeUI(frame.getRootPane());
                    } catch (Exception t) {
                    }
                }
            });
            lafMenu.add(lafItem);
        }        return lafMenu;
    }
}