Java full screen image viewer

[Nipuna]

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import java.awt.Graphics; 
import java.awt.GraphicsEnvironment; 
import java.awt.Image; 
import java.awt.Toolkit; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.WindowAdapter; 
import java.awt.event.WindowEvent; 
import java.net.MalformedURLException; 
import java.net.URL; 
 
import javax.swing.JFrame; 
 
public class Test1 extends JFrame { 
 
    // this line is needed to avoid serialization warnings  
    private static final long serialVersionUID = 1L;
 
 
    Image screenImage; // downloaded image  
    int w, h; // Display height and width 
 
 
    // Program entry 
    public static void main(String[] args) throws Exception { 
        if (args.length < 1) // by default program will load AnyExample logo 
            new Test1("http://www.anyexample.com/i/logo.gif"); 
        else 
            new Test1(args[0]); // or first command-line argument 
    } 
 
    // Class constructor  
    Test1(String source) throws MalformedURLException { 
 
        // Exiting program on window close 
        addWindowListener(new WindowAdapter() { 
            public void windowClosing(WindowEvent e) { 
                System.exit(0);
            } 
        });
 
        // Exitig program on mouse click 
        addMouseListener(new MouseListener() { 
            public void mouseClicked(MouseEvent e) { System.exit(0); } 
            public void mousePressed(MouseEvent e) {} 
            public void mouseReleased(MouseEvent e) {} 
            public void mouseEntered(MouseEvent e) {} 
            public void mouseExited(MouseEvent e) {} 
        } 
        );
 
        // remove window frame  
        this.setUndecorated(true);
 
        // window should be visible 
        this.setVisible(true);
 
        // switching to fullscreen mode 
        GraphicsEnvironment.getLocalGraphicsEnvironment().
        getDefaultScreenDevice().setFullScreenWindow(this);
 
        // getting display resolution: width and height 
        w = this.getWidth();
        h = this.getHeight();
        System.out.println("Display resolution: " + String.valueOf(w) + "x" + String.valueOf(h));
 
        // loading image  
        if (source.startsWith("http://")) // http:// URL was specified 
            screenImage = Toolkit.getDefaultToolkit().getImage(new URL(source));
        else 
            screenImage = Toolkit.getDefaultToolkit().getImage(source); // otherwise - file 
    } 
 
    public void paint (Graphics g) { 
        if (screenImage != null) // if screenImage is not null (image loaded and ready) 
            g.drawImage(screenImage, // draw it  
                        w/2 - screenImage.getWidth(this) / 2, // at the center  
                        h/2 - screenImage.getHeight(this) / 2, // of screen 
                        this);
            // to draw image at the center of screen 
            // we calculate X position as a half of screen width minus half of image width 
            // Y position as a half of screen height minus half of image height 
    } 
 
 
} 

warning

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This program will display nothing if the image was not loaded.