如何删除JButton中文本周围的蓝线？

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

public class CustomButton extends JButton {
    public CustomButton(String text) {
        super(text);
        setFocusPainted(false); // 禁用焦点绘制
        setBorderPainted(false); // 禁用边框绘制
    }

    @Override
    protected void paintComponent(Graphics g) {
        if (!isOpaque() && getBorder() instanceof javax.swing.border.AbstractBorder) {
            Graphics2D g2 = (Graphics2D) g.create();
            g2.setPaint(getBackground());
            g2.fillRect(0, 0, getWidth(), getHeight());
            g2.dispose();
        }
        super.paintComponent(g);
    }
}

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Custom Button Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        CustomButton button = new CustomButton("Click Me");
        frame.getContentPane().add(button);
        
        frame.pack();
        frame.setVisible(true);
    }
}