JRadioButton() constructor from JRadioButton has the following syntax.
public JRadioButton()
In the following code shows how to use JRadioButton.JRadioButton() constructor.
/*from www . j a v a2 s . c o m*/ import javax.swing.ButtonGroup; import javax.swing.ButtonModel; import javax.swing.JRadioButton; public class Main { public static void main(String[] argv) throws Exception { JRadioButton radioButton = new JRadioButton(); ButtonGroup group = new ButtonGroup(); ButtonModel model = radioButton.getModel(); group.setSelected(model, true); } }