give it a try
package hussi.screenshot;
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 Screenshot
{
public static void main(String[] args)
{
Screenshot obj = new Screenshot();
try{
obj.captureScreen("HussiScreenshot.png");
}
catch(Exception e)
{
System.out.println(e);
}
}
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));
}
}