Storing and sending array of Integers as bytes in java

Asked Nov 02 '17 at 15:37

Active Nov 02 '17 at 18:38

Viewed 41 times

I need to send an array of bytes ( few elements have values greater than 0x7F) which I need to send to another device via socket in form of bytes. This I need to do in Java (Android application). As java has only signed byte support hence I store the values in an array of int.

Now to transmit the values over socket to the device so as it could recieve the bytes I am not able to figure out a way.

I can not cast each element in byte and construct byte array as values more than 0x7f will overflow. I can not send values like 0xff in 2 bytes as it will send two bytes with first byte having 0.

Edit:

Suppose I have 2 values 0xff and 0x02 which means 11111111 and 00000010 then how do i store it and then send in java

Edit 2: casting does not result in overflow as byte is 8 bits.

edited Nov 02 '17 at 18:38

asked Nov 02 '17 at 15:37

nits.kk

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Signedness is just a representation. The socket doesn't care whether you think that `0xFF` is `-1` or `255`. – Kayaman Nov 02 '17 at 15:39
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try byte[] array, it will work fine – Evgeniy Dorofeev Nov 02 '17 at 15:40
hmm suppose i have 2 values 0xff and 0x02 which means 11111111 and 00000010 then how do i store it and then send in java – nits.kk Nov 02 '17 at 15:47
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`byte[] b = new byte[] { (byte)0xFF, (byte)0x02 };` there's your bytes. – Kayaman Nov 02 '17 at 15:53
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"I can not cast each element in byte and construct byte array as values more than 0x7f will overflow. ". Of course you can, and that's exactly what you need to do. There is no **overflow** involved here, all your values will fit into 8 bits. – Kayaman Nov 02 '17 at 18:19
yes , i got it.. thnks :) – nits.kk Nov 02 '17 at 18:37

Storing and sending array of Integers as bytes in java

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