Question

Basically, I am trying to create an app, that displays images.

filename variable is a path to an image that I want to display. After I start an app, an Image is displayed, but then, when I remove the image from a hard drive (or change other image to the filename name) I don’t get any other Image, just the same as before.

public static void main(final String[] args) {

    String filename = "C:\\temp\\1.jpeg";
    JFrame frame = new JFrame();
    frame.getContentPane().add(new JLabel(new ImageIcon(filename)));
    frame.pack();
    frame.setVisible(true);

    // Mouse Listener is only to display another JFrame after mouseClicked event
    frame.addMouseListener(new MouseListener() {

        public void mouseClicked(MouseEvent e) {
            main(args);
        }

        public void mousePressed(MouseEvent e) {
        }

        public void mouseReleased(MouseEvent e) {
        }

        public void mouseEntered(MouseEvent e) {
        }

        public void mouseExited(MouseEvent e) {
        }
    });
}

Answer 1

The image is cached. You need to force it to reload by doing either:

//  This works using ImageIO

imageLabel.setIcon( new ImageIcon(ImageIO.read( new File(imageName) ) ) );

//  Or you can flush the image

ImageIcon icon = new ImageIcon(imageName);
icon.getImage().flush();
imageLabel.setIcon( icon );