JavaSwing JRadioButton

try
        {
            BeautyEyeLNFHelper.frameBorderStyle = BeautyEyeLNFHelper.FrameBorderStyle.osLookAndFeelDecorated;
            //UIManager.put("RootPane.setupButtonVisible", false);
            org.jb2011.lnf.beautyeye.BeautyEyeLNFHelper.launchBeautyEyeLNF();
            
        }
        catch(Exception e)
        {
            //TODO exception
        }
        
        // 创建窗体对象
        JFrame jFrame =new JFrame();
        // 设置窗体大小
        jFrame.setSize(800, 500);
        // 设置窗体全屏展示
        //jFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        // 设置窗体显示位置
        //jFrame.setLocation(100,200);
        // 设置窗体显示正中间
        jFrame.setLocationRelativeTo(null);
        // 设置窗体标题
        jFrame.setTitle("窗体标题");
        // 设置窗体不可全屏显示
        //jFrame.setResizable(false);
        // 设置窗体关闭后退出程序
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //设置此窗口是否应该始终位于其他窗口上方
        jFrame.setAlwaysOnTop(true);
        // 设置窗体图标
        jFrame.setIconImage(new ImageIcon(HelloWorld.class.getResource("/images/book.png")).getImage());
        

        
        // 创建容器
        JPanel jPanel =new JPanel(new FlowLayout());
        
        JRadioButton nan =new JRadioButton("男",false);
        JRadioButton nv =new JRadioButton("女",true);
        // ButtonGroup实现互斥
        ButtonGroup group =new ButtonGroup();
        group.add(nv);
        group.add(nan);
        
        
        
        JButton btn =new JButton("提交");
        btn.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                
                if(nan.isSelected()) {
                    System.out.println(nan.getText());
                }
                if(nv.isSelected()) {
                    System.out.println(nv.getText());
                }
                
            }
            
        });
        
        
        
        
        jPanel.add(btn);
        jPanel.add(nan);
        jPanel.add(nv);
        
        
        jFrame.setContentPane(jPanel);

        
        // 设置窗体可见
        jFrame.setVisible(true);