How to Fix Look and Feel Issues with Swing JTabbedPane After an Update?

Fixing Look and Feel Update Issues in Swing JTabbedPane

In Java Swing applications, modifying the look and feel often involves updating the UI of all components. However, issues arise when adding new tabs to JTabbedPane, where the new tab might not adopt the updated look and feel.

To address this, you can utilize the SwingUtilities.updateComponentTreeUI(window) method. This method updates the UI of a window, including JTabbedPane, provided as the window parameter.

Improved Solution

However, as demonstrated by @Andrew in an earlier response, this method alone may not sufficiently update the JTabbedPane UI. To overcome this limitation, you can consider implementing a more comprehensive solution:

import java.awt.Window;
import java.util.Arrays;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;

public class JTabbedPaneLookAndFeelFix {

    public static void updateLookAndFeel(JTabbedPane tabbedPane) {
        // Obtain an array of all windows
        Window[] windows = Frame.getWindows();

        // Update the UI of each window
        Arrays.stream(windows)
                .forEach(window -> SwingUtilities.updateComponentTreeUI(window));

        // Specifically target the JTabbedPane instance for UI update
        SwingUtilities.updateComponentTreeUI(tabbedPane);
    }
}

This updated approach ensures that not only the parent window but also the JTabbedPane itself receives the UI update, effectively resolving any look and feel inconsistencies.

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