Create a custom JLabel with underlined text in Java

/*from  www  .j a v  a2  s. com*/
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.JLabel;
import java.awt.GridLayout;

import javax.swing.JFrame;

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Popup JComboBox");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.add(new UnderlinedLabel("java2s.com"));
    frame.setSize(300, 200);
    frame.setVisible(true);
  }

}

class UnderlinedLabel extends JLabel {
  public UnderlinedLabel() {
    this("");
  }

  public UnderlinedLabel(String text) {
    super(text);
  }

  public void paint(Graphics g) {
    Rectangle r;
    super.paint(g);
    r = g.getClipBounds();
    g.drawLine(0, r.height - getFontMetrics(getFont()).getDescent(), getFontMetrics(getFont())
        .stringWidth(getText()), r.height - getFontMetrics(getFont()).getDescent());
  }
}