Image Program in Java

import java.awt.*;                    
import java.awt.event.*;
class Images extends Frame
{
static Image img;
Images()
{
img=Toolkit.getDefaultToolkit().getImage(" ");
MediaTracker track= new MediaTracker(this);
track.addImage(img,0);
try{
track.waitForID(0);
}catch(InterruptedException ie){}
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
public void paint (Graphics g)
{
g.drawImage(img,50,50,null);
}
public static void main(String args[])
{
Images i= new Images();
i.setSize(500,400);
i.setTitle("My images");
i.setIconImage(img);
i.setVisible(true);
}
}