Question

I wanted to display on the JFrame on the program the full screenshot of my screen.
So far using the code below, I was able only to display part of the screen.
The code below is the content of the paint(Graphics g).
How can I make it full screen?

// the screen resolution is 1280 x 1024 while the JPanel size is only 1024 x 768
Dimension resolution = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle rectangle = new Rectangle(resolution);
robot = new Robot();
BufferedImage bufferedImage = robot.createScreenCapture(rectangle);                                
g.drawImage(bufferedImage.getScaledInstance(bufferedImage.getWidth(), bufferedImage.getHeight(), Image.SCALE_DEFAULT), 0, 0, null);

Answer 1

Maybe using something like this:

//get the screen size
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
BufferedImage image = robot.createScreenCapture (dim);
//other code
//...

I see you have some errors, I don’t know if your code even compiles, ’cause references seems not to be declared, but a code similar to this one will caputure a screenshoot of your desktop:

import java.awt.geom.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;

public class ScreenCapturer
{
    public static void main(String[] args)throws Exception
    {
        Dimension resolution = Toolkit.getDefaultToolkit().getScreenSize();
        Rectangle rectangle = new Rectangle(resolution);
        Robot robot = new Robot();
        BufferedImage bufferedImage = robot.createScreenCapture(rectangle);
        Graphics g = bufferedImage.getGraphics();
        //g.drawImage(bufferedImage.getScaledInstance(bufferedImage.getWidth(), bufferedImage.getHeight(), Image.SCALE_DEFAULT), 0, 0, null);
        File out = new File("image.png");
        ImageIO.write(bufferedImage,"png",out);
    }
}

I saved to an png image file instead of drawing it on the screen or the frame.