Take a Screenshot with Java

screenshot.java

import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.Desktop;
import java.io.File;

import javax.imageio.ImageIO;

public class Main {
	
    public static void main(String[] args) throws Exception
    {
    	Robot r = new Robot();
    	
    	BufferedImage screenShot = r.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
    	ImageIO.write(screenShot, "JPG", new File("screenshot.jpg"));
    }
    
}

nice!