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Asked: 2026-05-13T21:30:19+00:00

I need the advice from someone who knows Java very well and the memory

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I need the advice from someone who knows Java very well and the memory issues.
I have a large file (something like 1.5GB) and I need to cut this file in many (100 small files for example) smaller files.

I know generally how to do it (using a BufferedReader), but I would like to know if you have any advice regarding the memory, or tips how to do it faster.

My file contains text, it is not binary and I have about 20 character per line.

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  1. Editorial Team

    First, if your file contains binary data, then using BufferedReader would be a big mistake (because you would be converting the data to String, which is unnecessary and could easily corrupt the data); you should use a BufferedInputStream instead. If it’s text data and you need to split it along linebreaks, then using BufferedReader is OK (assuming the file contains lines of a sensible length).

    Regarding memory, there shouldn’t be any problem if you use a decently sized buffer (I’d use at least 1MB to make sure the HD is doing mostly sequential reading and writing).

    If speed turns out to be a problem, you could have a look at the java.nio packages – those are supposedly faster than java.io,

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