JRadioButton的初始的是否可选性设置

Question

各位大虾，小弟最近做java的课程大作业，遇到一个问题，就是创建了JRadioButton english，math...
然后，创建了一个JmenuItem sort，我想设置JRadioButton的初始可选性是不可选的，在点击了sort后，JRadioButton才变为可选的，请问这个设置JRadioButton的初始可选性的函数是什么啊！不胜感激！！

Answer 1

jradio.setEnabled(false);
jradio.setEnabled(true);

Answer 2

这是一个具体的实例
public class JRadioButtonDemo1 extends JFrame {
    private boolean isEnable=false;
    private final ButtonGroup genderGroup=new ButtonGroup();
    private JRadioButton boyBtn=null;
    private JRadioButton girlBtn=null;    public JRadioButtonDemo1(){}    public JRadioButtonDemo1(String title){
        super(title);
        boyBtn=new JRadioButton("boy");
        girlBtn=new JRadioButton("girl");
        genderGroup.add(boyBtn);
        genderGroup.add(girlBtn);
         Enumeration<AbstractButton> btns=genderGroup.getElements();
         while(btns.hasMoreElements()){
                    AbstractButton btn=btns.nextElement();
                    btn.setEnabled(JRadioButtonDemo1.this.isEnable);
                }        this.getContentPane().setLayout(new FlowLayout());
        this.getContentPane().add(boyBtn);
        this.getContentPane().add(girlBtn);
        final JButton radioCtl=new JButton("enable");
        radioCtl.addActionListener(new ActionListener(){            @Override
            public void actionPerformed(ActionEvent e) {
                //To change body of implemented methods use File | Settings | File Templates.
                if(JRadioButtonDemo1.this.isEnable){
                    radioCtl.setText("enable");
                }else{
                    radioCtl.setText("disable");
                }
                JRadioButtonDemo1.this.isEnable=!JRadioButtonDemo1.this.isEnable;                Enumeration<AbstractButton> btns=genderGroup.getElements();
                while(btns.hasMoreElements()){
                    AbstractButton btn=btns.nextElement();
                    btn.setEnabled(JRadioButtonDemo1.this.isEnable);
                }
            }
        });
       this.getContentPane().add(radioCtl);
        girlBtn.addActionListener(new ActionListener(){            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
// genderGroup.getSelection().g
                System.out.println(girlBtn.getText());
                System.out.println("girlBtn is selected is "+girlBtn.isSelected());            }        });        boyBtn.addActionListener(new ActionListener(){            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
                System.out.println(boyBtn.getText());
                System.out.println("boyBtn is selected is "+boyBtn.isSelected());            }        });
        this.pack();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }    public static void main(String[] args){
        new JRadioButtonDemo1("Demo");
    }}