Get Desktop Snapshot with Java

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;

public class Screenshooter {
  public static void main (String[] args) throws Exception {
    Screenshooter screenshooter = new Screenshooter ();
    screenshooter.captureScreen ("/tmp/desktopSnapshot.png");
  }

  public void captureScreen (String fileName) throws Exception {

    Dimension screenSize = Toolkit.getDefaultToolkit ().getScreenSize ();
    Rectangle screenRectangle = new Rectangle (screenSize);
    Robot robot = new Robot ();
    BufferedImage image = robot.createScreenCapture (screenRectangle);
    ImageIO.write (image, "png", new File (fileName));

  }

}