Revalidate JPanel's parent frame?

I need show/hide some fields of my panel, and I want the panel to fit the frame. You mean like a summary/details view and you want the frame size to change? Then try: SwingUtilities.

WindowForComponent(...).pack().

You could override the addNotify in the panel into something: public void addNotify() { getParent().revalidate(); repaint(); super.addNotify(); } Not sure if that's what you mean though.

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