Is ImageIO.write buffered?

Question

Should I write

BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(file));
ImageIO.write(im, "JPEG", os);

instead of

ImageIO.write(im, "JPEG", file);

I.e. are ImageIO file operations buffered by default or not?

Thanks!

Answer 1

If you pass in a File, the underlying implementation will write directly to a RandomAccessFile (created in "rw" mode), so no buffering. Specifically, a FileImageOutputStream will be used as the ImageOutputStream.