Change JTabbedPane active tab color dynamically

Question

My requirement is to change tabs colos of JTabbedPane dynamically. Like change of tabs and selected tabs colors on button click. For the same reason I cannot use UIManager. But tabs color once set and changing tab is not working properly. Also selected tab is always showing default color and not the one I set.

Below is the code:

import javax.swing.*;
import java.awt.*;

public class TestJTP extends JFrame {

    JTabbedPane tabbedPane;
    public TestJTP() {
        init();
    }

    private void init() {

        tabbedPane = new JTabbedPane();
        tabbedPane.addTab("Tab-1", null);
        tabbedPane.addTab("Tab-2", null);
        tabbedPane.addTab("Tab-3", null);
        tabbedPane.addTab("Tab-4", null);
        tabbedPane.addTab("Tab-5", null);

        JPanel panel = new JPanel();
        JButton b1 = new JButton("Orange,blue");
        b1.addActionListener(e -> {
            tabbedPane.setBackground(null);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), null);
            tabbedPane.setBackground(Color.orange);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), Color.blue);
        });
        JButton b2 = new JButton("Red,cyan");
        b2.addActionListener(e -> {
            tabbedPane.setBackground(null);
            tabbedPane.setBackground(Color.red);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), null);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), Color.cyan);
        });
        JButton b3 = new JButton("Green,magenta");
        b3.addActionListener(e -> {
            tabbedPane.setBackground(null);
            tabbedPane.setBackground(Color.green);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), null);
            tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), Color.magenta);
        });
        panel.add(b1);
        panel.add(b2);
        panel.add(b3);
        getContentPane().add(panel, BorderLayout.NORTH);
        getContentPane().add(tabbedPane, BorderLayout.CENTER);
        pack();
        setVisible(true);
        setExtendedState(JFrame.MAXIMIZED_BOTH);
    }

    public static void main(String[] args) {
        new TestJTP();
    }
}

Answer 1

If I understand what you are asking try:

//tabbedPane.setBackground(null);
tabbedPane.setBackground(Color.red);
//tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), null);
//tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(), Color.cyan);
UIManager.put("TabbedPane.selected", Color.CYAN);
SwingUtilities.updateComponentTreeUI(tabbedPane);

This should reset the default "tab selection color" and the "tab color" for all tabs.