public class ScreenShot
{
    public static void main(String[] args)
    {
        try
        {
            // Get the screen size
            Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
            Rectangle rectangle = new Rectangle(0, 0, screenSize.width,
                    screenSize.height);
            Robot robot = new Robot();
            BufferedImage image = robot.createScreenCapture(rectangle);
            File file;

            // Save the screenshot as a png
            file = new File("screen.png");
            ImageIO.write(image, "png", file);

        } catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}