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I have two JPanels that needs to add a JPanel into it, however only the last added JPanel does it show the JPanel. As shown below:
holderPanel1.add(dataPanel);
holderPanel2.add(dataPanel);
only holderPanel2 shows the dataPanel, but holderPanel1 does not show.
UI Components (such as JPanel) are the underline representation of things you see on the screen (location, parent, sub-components etc.), so each panel that you see on the screen has to have a separate underline representation, so you cannot add a panel to two different panels, you need to create two separate panels.