Set JPanel visible if checkbox is selected

I got two Classes:

1) Panel A

2) Panel B

On Panel A, I got a checkbox, which (if selected) should set Panel B visible. This is what I got so far:

        public class PanelA extends JPanel {

        public static JCheckBox shopBox;

        public PanelA() {
            setVisible(PanelB.checkBox.isSelected());
    }
}

And this is a part of JPanel B:

        checkBox = new JCheckBox("Show PanelA");
        add(checkBox);

        checkBox.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            //PanelA.setVisible(virusBox.isSelected());
        }
    });

Now this doesnt work. How can I make JPanelB visible/invisible regarding the state of the JCheckBox on JPanelA??

Greetings