Why Doesn\'t My Swing JTabbedPane Update Its Look and Feel After Adding a New Tab?

Look and Feel Does Not Update in Swing JTabbedPane

You have created an application in Java Swing that allows users to change the look and feel from a menu. After adding a new tab in JTabbedPane, however, the changes in look and feel are not reflected in the new tab.

Solution

To address this issue, combine the approaches suggested by @Andrew and a classic solution from swingjs.org:

Window windows[] = Frame.getWindows();
for (Window window : windows) {
    SwingUtilities.updateComponentTreeUI(window);
    window.invalidate();
    window.validate();
    window.repaint();
}

This code updates the look and feel, invalidates and validates the windows, and repaints them to ensure proper rendering.

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