public   class  TestFrame  extends  JFrame {

     private  JRadioButton but =  null ;
     private  JTextField field =  null ;

     public  TestFrame () {
        setSize( 800 ,  600 );
        but =  new  JRadioButton ("setEditable");
        but.setSelected(true);
        field =  new  JTextField ("Test Text");
        field.setEditable(true);

        Container contentPane = getContentPane();
        contentPane.setLayout( new  BorderLayout( 1 , 1 ));
        contentPane.add(but, BorderLayout.NORTH);
        contentPane.add(field, BorderLayout.SOUTH);

        but.addActionListener( new  ActionListener() {
             public   void  actionPerformed(ActionEvent e){
                 if (but.isSelected()) {
                    field.setEditable(true);
                }
                 else  {
                    field.setEditable(false);
                }
            }
        });
        
    }
}