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