java 窗口关闭

        JFrame fr=new JFrame();
        fr.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) {
                 int dialog=JOptionPane.showConfirmDialog(null,"是否保存表中信息","选择",JOptionPane.WARNING_MESSAGE);
if(dialog==0){
//保存
}
if(dialog==1){
                                 ？？？？？？？;
}
}
        });
？？？？当弹出对话框中选择取消关闭窗口fr该怎么写？