public class DBUploadDialog extends MainDialog{

private JFileChooser fileChooser = new JFileChooser(".jpg");

private JLabel ipjLabel = new JLabel();
private JTextField ipTField = new JTextField();
JLabel jLabel1 = new JLabel();

private JButton ftpButton = new JButton();
private JTextField ftpDirTField = new JTextField();

private JButton targetButton = new JButton();
private JTextField targetDirTField = new JTextField();


private JRadioButton kaKouSwitchJRadio=new JRadioButton();
private JRadioButton sjsjSwitchRadio=new JRadioButton();
private JRadioButton weifaSwitchRadio=new JRadioButton();
private JRadioButton deviceSwitchRadio=new JRadioButton();

。。。。。。。。

add(ftpButton);
add(ftpDirTField);
add(targetButton);
add(targetDirTField);
add(ipjLabel);
add(ipTField);
add(jLabel1);
// 以下是单选按钮 
add(kaKouSwitchJRadio);
add(sjsjSwitchRadio);
add(weifaSwitchRadio);
add(deviceSwitchRadio);

可是界面上 就显示一个 单选按钮 求解决办法