How to change the components in a visible JPanel?

How to change the components in a visible JPanel?
Is there any way to change the components in a JPanel while it is already visible in a JFrame? I tried the na�ve approach of removing the components and adding new ones, but the effect is not the expected.
For now I'm opening new frames with newly created panels.

After adding/removing components to/from a panel try:
panel.revalidate();
panel.repaint() // sometimes this is also needed, I'm
not sure whyI'm not certain, but I think that panel.revalidate() implicitly calls repaint() only if something actually changed in the layout. If nothing changed, it sees no reason to repaint; hence, if something changed in appearance but not in layout, you have to repaint it yourself.
Or something like that. I'm no expert. ;)

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