How are colors of custom editor set? How to intercept/listen it?

I wrote my example of custom editor

public class LineageFileEditor implements FileEditor {
...
@Override public @NotNull JComponent getComponent() {
   return new JSwingExample02();
}

and it returns my custom JComponent:

public class JSwingExample02 extends JComponent {

   public JSwingExample02() {
      populate();
   }

   private void populate() {
      setLayout(new BorderLayout());
      add(new JLabel("Hello World"), BorderLayout.CENTER);
   }

It works and draws

As you see, I am using dark theme and my component has inherited it.

How was it done? I have intercepted calls to `setBackground` and `setForeground` methods, but they haven't called.

How to intercept stting of colors in order to have my own derived drawings?