import java.awt.AWTException;
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;
import java.io.IOException;

public class ScreenCapture {
    public static void main(String args[]) throws AWTException, IOException
    {

        // capture the whole screen
        int i=1000;
        while(true)
        {
            i++;
            Robot robot = new Robot();
            BufferedImage screencapture = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));

            // Save as JPEG
            // File file = new File("screencapture"+i+".jpg");
            // ImageIO.write(screencapture, "jpg", file);

            // Save as PNG
            File file = new File("screencapture"+i+".png");
            ImageIO.write(screencapture, "png", file);

            try
            {
                Thread.sleep(60*4*1000);
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }
}