如何在jprogressbar上添加文本？

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

public class JProgressBarWithText extends JProgressBar {
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setFont(getFont());
        g2d.setColor(getForeground());
        String text = getValue() + "%";
        int textWidth = g2d.getFontMetrics().stringWidth(text);
        int textHeight = g2d.getFontMetrics().getHeight();
        int x = getWidth() / 2 - textWidth / 2;
        int y = getHeight() / 2 + textHeight / 2;
        g2d.drawString(text, x, y);
    }
}

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("JProgressBar with Text");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400, 200);

            JProgressBarWithText progressBar = new JProgressBarWithText();
            progressBar.setValue(50);
            progressBar.setStringPainted(false);
            frame.getContentPane().add(progressBar, BorderLayout.CENTER);

            frame.setVisible(true);
        });
    }
}