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Asked: 2026-05-11T01:05:31+00:00

I have a JPanel subclass on which I add buttons, labels, tables, etc. To

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I have a JPanel subclass on which I add buttons, labels, tables, etc. To show on screen it I use JFrame:

MainPanel mainPanel = new MainPanel(); //JPanel subclass  JFrame mainFrame = new JFrame(); mainFrame.setTitle('main window title'); mainFrame.getContentPane().add(mainPanel); mainFrame.setLocation(100, 100); mainFrame.pack(); mainFrame.setVisible(true); mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

But when I size the window, size of panel don’t change. How to make size of panel to be the same as the size of window even if it was resized?

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  1. You can set a layout manager like BorderLayout and then define more specifically, where your panel should go:

    MainPanel mainPanel = new MainPanel(); JFrame mainFrame = new JFrame(); mainFrame.setLayout(new BorderLayout()); mainFrame.add(mainPanel, BorderLayout.CENTER); mainFrame.pack(); mainFrame.setVisible(true);

    This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame.

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