Create a JLabel to show URL with underscore in Java

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.net.MalformedURLException;
import java.net.URL;
/*from   w w  w.  ja v a2  s  .c  o m*/
import javax.swing.JFrame;
import javax.swing.JLabel;

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

    frame.add(new URLLabel(new URL("http://java2s.com")));
    frame.setSize(300, 60);
    frame.setVisible(true);

  }
}

class URLLabel extends JLabel {

 boolean entered = false;

 boolean mousehover;

 public URLLabel(URL url) {
   this(url, url.toString());
 }

 public URLLabel(URL url, String str) {
   super(str);

   setForeground(Color.blue);
   mousehover = false;

 }

 public void mouseEntered(MouseEvent e) {
   setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
   entered = true;

   if (mousehover) {
     repaint();
   }
 }

 public void mouseExited(MouseEvent e) {
   setCursor(Cursor.getDefaultCursor());
   entered = false;

   if (mousehover) {
     repaint();
   }
 }

 public void mousePressed(MouseEvent e) {
 }

 public void mouseReleased(MouseEvent e) {
 }

 public void paint(Graphics g) {
   super.paint(g);

   if (entered || !mousehover) {
     Rectangle r = g.getClipBounds();

     g.drawLine(0, r.height - this.getFontMetrics(this.getFont()).getDescent(), this
         .getFontMetrics(this.getFont()).stringWidth(this.getText()), r.height
         - this.getFontMetrics(this.getFont()).getDescent());
   }
 }
}


//The contents of this file are subject to the Mozilla Public License Version 1.1
//(the "License"); you may not use this file except in compliance with the 
//License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
//
//Software distributed under the License is distributed on an "AS IS" basis,
//WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
//for the specific language governing rights and
//limitations under the License.
//
//The Original Code is "The Columba Project"
//
//The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
//Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003. 
//
//All Rights Reserved.