Preferred way to use Java ZipOutputStream and BufferedOutputStream

Question

In Java does it matter whether I instantiate a ZipOutputStream first, or the BufferedOutputStream first? Example:

FileOutputStream dest = new FileOutputStream(fi         


        

Answer 1

You should:

ZipOutputStream out =  new ZipOutputStream(new BufferedOutputStream(dest));

because you want to buffer the writing to the disc (because this is much more efficient in big data blocks than in a lot of little ones).

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This

new BufferedOutputStream(new ZipOutputStream(dest));

would buffer before zip compression. But this all happens in the memory and does not need buffering because a lot of little memory accesses are about the same speed as a few big ones. In memory general the needed time is proportional to the number of bytes read/write.

As mentioned in the comments:

The methods of ZipOutputStream which are not part of BufferedOutputStream would not be available also. E.g. putNextEntry and closeEntry.