JRadioButton单选按钮代码2

public class JRadioButtonTest extends JApplet{

public JRadioButtonTest () {
Container contentPane = getContentPane();
Icon icon = new ImageIcon("Login.gif");
ButtonGroup group = new ButtonGroup();
JRadioButton[] radioButtons = new JRadioButton[] {
new JRadioButton(),
new JRadioButton(icon),
new JRadioButton(icon, true),
new JRadioButton("idea!"),
new JRadioButton("idea!",true),
new JRadioButton("idea!",icon),
new JRadioButton("idea!",icon, true)
};
contentPane.setLayout(new FlowLayout());


for(int i=0; i < radioButtons.length; ++i) {
group.add(radioButtons[i]);
radioButtons[i].setBorderPainted(true);
contentPane.add(radioButtons[i]);

if(radioButtons[i].getIcon() != null) {
System.out.println("setting selected icon");
radioButtons[i].setSelectedIcon(new ImageIcon("Login.gif"));
}
}
}
}