如何获取Java netbeans中所有选中复选框的字符串值

这是我的代码，它在输出上没有显示任何内容，我尝试了一些其他方法，如arraylist和list，但我不明白，结果是错误太多

jButton1.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent Arg0){
        JOptionPane.showMessageDialog(null, getSelected());
             }
    });

 public String getSelected() {
    //To change body of generated methods, choose Tools | Templates.
    String subs ="";

    for (Component c:getComponents()){
        if(c instanceof JCheckBox)
            if(((JCheckBox)c).isSelected())
                subs +=((JCheckBox)c).getText()+",";
    }
     return subs;
}