不要用JPEGImageEncoder無法F11

不要用JPEGImageEncoder 而是使用ImageIO.write(bi, "png", outputfile); 來替代!!否則無法F11

try {

    // retrieve image
    BufferedImage bi = getMyImage();
    File outputfile = new File("saved.png");
    ImageIO.write(bi, "png", outputfile);
} catch (IOException e) {
    ...
}

The ImageI
http://docs.oracle.com/javase/tutorial/2d/images/saveimage.html