else if(source==java){ // 金屬外觀
try{
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exception exe){
exe.printStackTrace();
}
}else if(source==system){ // 本地外觀
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exception exe){
exe.printStackTrace();
}
}