如何在Java中编程创建圆边按钮？

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

public class RoundedButton extends JButton {
    public RoundedButton(String text) {
        super(text);
        setContentAreaFilled(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(getBackground());
        g2.fill(new RoundRectangle2D.Double(0, 0, getWidth() - 1, getHeight() - 1, 20, 20));
        super.paintComponent(g2);
        g2.dispose();
    }

    @Override
    protected void paintBorder(Graphics g) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(getForeground());
        g2.draw(new RoundRectangle2D.Double(0, 0, getWidth() - 1, getHeight() - 1, 20, 20));
        g2.dispose();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Rounded Button Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 100);
        frame.setLayout(new FlowLayout());

        RoundedButton button = new RoundedButton("Click Me");
        frame.add(button);

        frame.setVisible(true);
    }
}