Java Swing - 如何将文本放在按钮的图像顶部

import java.awt.Graphics;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
  public static void main(String[] args) {

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel pnl = new JPanel();
    pnl.add(new MyButton());
    frame.add(pnl);
    frame.setSize(600, 600);
    frame.setVisible(true);
  }

}

class MyButton extends JButton {
  public void paint(Graphics g) {
    // draw image
    // the draw text
  }
}