Fastest way of reading relatively huge byte-files in Java

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I would use a memory mapped file which is fast enough to do in the same thread.

final FileChannel channel = new FileInputStream(fileName).getChannel();
MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());

// when finished
channel.close();

This assumes the file is smaller than 2 GB and will take 10 milli-seconds or less.

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