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JPanel Snapshot and save the image in a file.It shows black image.what to do?

You are creating an empty BufferedImage, to paint the Jpanel on it use:

  try {
        BufferedImage image = new BufferedImage(mypanel.getWidth(),
                mypanel.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
        Graphics g = image.getGraphics();
        ImageIO.write(image, "png", new File("img.png"));
    } catch (Exception e) {

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