Create A Transparent Window in Java

I recently read a post the read Another Thing Java Cannot Do In Java. And it read:
"you cannot create a popup window shaped like this:

Because Java does not support transparent windows"

Well here is a cool code to create "Transparent Window" in java.For more you can go in for this awesome book Swing Hacks by Joshua Marinnaci it is the best book with many more awesome tricks i have a copy and recommend to everyone(a must buy for those who are seriously interested in java)

import java.awt.*;
import java.util.Date;
import javax.swing.*;
import java.awt.event.*;
public class BGTest1 {

public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Window");
TransparentBackground bg = new TransparentBackground(frame);
bg.setLayout(new BorderLayout());

JButton button = new JButton("This is a button");
bg.add("North",button);
JLabel label = new JLabel("This is a label");
bg.add("South",label);
frame.getContentPane().add("Center",bg);
frame.pack();
frame.setSize(300,300);
frame.show();
}

}
class TransparentBackground extends JComponent
implements ComponentListener, WindowFocusListener,
Runnable {
private JFrame frame;
protected Image background;
private long lastupdate = 0;
public boolean refreshRequested = true;

public TransparentBackground(JFrame frame) {
this.frame = frame;

updateBackground();
frame.addComponentListener(this);
frame.addWindowFocusListener(this);
new Thread(this).start();
}

public void updateBackground() {
try {
Robot rbt = new Robot();
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension dim = tk.getScreenSize();
background = rbt.createScreenCapture(
new Rectangle(0,0,(int)dim.getWidth(),(int)dim.getHeight()));
} catch (Exception ex) {
p(ex.toString());
ex.printStackTrace();
}
}

public void paintComponent(Graphics g) {
Point pos = this.getLocationOnScreen();
Point offset = new Point(-pos.x,-pos.y);
g.drawImage(background,offset.x,offset.y,null);
}


public void componentShown(ComponentEvent evt) { repaint(); }
public void componentResized(ComponentEvent evt) { repaint(); }
public void componentMoved(ComponentEvent evt) { repaint(); }
public void componentHidden(ComponentEvent evt) { }

public void windowGainedFocus(WindowEvent evt) { refresh(); }
public void windowLostFocus(WindowEvent evt) { refresh(); }

public void refresh() {
if(this.isVisible() && frame.isVisible()) {
repaint();
refreshRequested = true;
lastupdate = new Date().getTime();
}
}

/*
private boolean recurse = false;
public void quickRefresh() {
p("quick refresh");
long now = new Date().getTime();
if(recurse ||
((now - lastupdate) < recurse =" true;" location =" frame.getLocation();" recurse =" false;" lastupdate =" now;" now =" new"> 1000)) {
if(frame.isVisible()) {
Point location = frame.getLocation();
frame.hide();
updateBackground();
frame.show();
frame.setLocation(location);
refresh();
}
lastupdate = now;
refreshRequested = false;
}
}
} catch (Exception ex) {
p(ex.toString());
ex.printStackTrace();
}
}


public static void p(String str) {
System.out.println(str);
}

}

here is the link to the book again

a must buy for those who are seriously interested in java