How can we Remove Icon from TrayIcon

import java.awt.AWTException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

public class SystemTrayDemo1 {
public static void main(String[] args) throws Exception {
if (!SystemTray.isSupported()) {
return;
}
SystemTray tray = SystemTray.getSystemTray();

PropertyChangeListener pcl;
pcl = new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent pce) {
System.out.println("Property changed = " + pce.getPropertyName());
TrayIcon[] tia = (TrayIcon[]) pce.getOldValue();
if (tia != null) {
System.out.println("Old tray icon array contents: ");
for (int i = 0; i < tia.length; i++)
System.out.println(tia[i]);
System.out.println();
}

tia = (TrayIcon[]) pce.getNewValue();
if (tia != null) {
System.out.println("New tray icon array contents: ");
for (int i = 0; i < tia.length; i++)
System.out.println(tia[i]);
System.out.println();
}
}
};
tray.addPropertyChangeListener("trayIcons", pcl);

Dimension size = tray.getTrayIconSize();
BufferedImage bi = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();

g.setColor(Color.blue);
g.fillRect(0, 0, size.width, size.height);
g.setColor(Color.yellow);
int ovalSize = (size.width < size.height) ? size.width : size.height;
ovalSize /= 2;
g.fillOval(size.width / 4, size.height / 4, ovalSize, ovalSize);

TrayIcon icon = null;
tray.add(icon = new TrayIcon(bi));

Thread.sleep(3000);
tray.remove(icon);

Thread.sleep(3000);
System.exit(0);
}

}