动态更改JTabbedPane活动选项卡颜色

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

public class TabbedPaneColorExample extends JFrame {
    private JTabbedPane tabbedPane;

    public TabbedPaneColorExample() {
        setTitle("TabbedPane Color Example");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);

        tabbedPane = new JTabbedPane();
        tabbedPane.addTab("Tab 1", new JPanel());
        tabbedPane.addTab("Tab 2", new JPanel());
        tabbedPane.addTab("Tab 3", new JPanel());

        // 添加选项卡切换监听器
        tabbedPane.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                // 获取当前活动选项卡的索引
                int selectedIndex = tabbedPane.getSelectedIndex();
                // 设置活动选项卡的背景颜色
                tabbedPane.setBackgroundAt(selectedIndex, Color.RED);
            }
        });

        getContentPane().add(tabbedPane);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TabbedPaneColorExample().setVisible(true);
            }
        });
    }
}