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I have a scenario where in based on a given String I need to return an integer value. I am hashing String to a byte array . Now since my Integer range is 0-999 which can be represented by 2bytes, I am hoping to use last two bytes of the byte array to convert to integer . But I am not getting the correct result

I have tried using Byte buffer wrap method , defining offset as length-3 and defining the length as 2

ByteBuffer.wrap(bytes,bytes.length-3,2).getInt()

I am expecting an Integer data based on the last two bytes of the array but getting Exception in thread "main" java.nio.BufferUnderflowException

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  • Why length-3 and not length-2? Commented Apr 25, 2019 at 15:56
  • The last two bytes are at length-2 and length-1. Commented Apr 25, 2019 at 16:02

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ByteBuffer#getInt reads 4 bytes starting at the current position, however your wrapped ByteBuffer has a remaining size (limit - position) of 2, hence it throws a BufferUnderflowException. Instead, you should use ByteBuffer#getShort, which can be stored in an int.

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2 Comments

Good answer. A minor and off-topic nitpick: brians.wsu.edu/2016/05/19/hence-why
@DodgyCodeException Thanks for the tip!

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