طريقة عمل رسالة تنبيه

import java.awt.*;
import java.awt.event.*;

public class Notifier extends JDialog implements ActionListener
{
Timer t;
int x, y, w, h;
Dimension screenDim;
final int UP = 0, DOWN = 1;
int direction = UP;
JLabel lbl = new JLabel("Some message");

public Notifier()
{
w = 120;
h = 120;
screenDim = Toolkit.getDefaultToolkit().getScreenSize();
x = (int)screenDim.getWidth() - w;
y = (int)screenDim.getHeight();

t = new Timer(200, this);

setTitle("Notification");
setBounds(x, y, w, h);
add(lbl);

t.start();

setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setAlwaysOnTop(true);
setVisible(true);
}
public void actionPerformed(ActionEvent ae)
{
if (y > (int)screenDim.getHeight()-h && direction == UP)
{
up();
if (y <= (int)screenDim.getHeight()-h)
try {
Thread.sleep(1000);
} catch (Exception e) {}
}
else
down();

if (y > (int)screenDim.getHeight())
{
t.stop();
dispose();
}
}
public void up()
{
y-=5;
setBounds(x, y, w, h);
}
public void down()
{
direction = DOWN;
y+=5;
setBounds(x, y, w, h);
}

public static void main(String[] args)
{
new Notifier();
}
}

 import javax.swing.*;