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Positioning JPanels in a JPanel

 
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Is there a way I can create 4 JPanels inside an outer JPanel, however
initially only the top JPanel is visible. Then when an event occurs the others appear 1 directly below the other with no gaps?

Thanks.
 
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Just put the panels in the appropriate layout, for example a BoxLayout, and hide() the three lower panels initially. Call show() on them once you want them to be visible.
 
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