java draggable jframe

1class MyWindow extends JFrame {
2  int posX=0,posY=0;
3  
4  public MyWindow(){
5   	this.setUndecorated(true);
6  	this.addMouseListener(new MouseAdapter()
7	{
8   		public void mousePressed(MouseEvent e)
9   		{
10      		posX=e.getX();
11      		posY=e.getY();
12   		}
13	});
14  }
15}