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Groups > comp.lang.java.programmer > #32891

Re: number to byte[]

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On 10/17/2015 02:03 PM, Eric Sosman wrote:
> On 10/17/2015 4:02 AM, Askfor wrote:
>> I am trying to get 4 byte[] representation of an integer, which might be
>> 32 bit long.
>>
>> Obviously, I could AND with 255 and take byteValue(), then shift 8 times
>> to the right and repeat the process 3 times. Is there any more elegant
>> way ?
>
>      I can't think of one, off-hand.
>
>      But *why* do you want this four-byte array?  Are you planning to
> write it to some output destination?  If so, perhaps you should use a
> DataOutputStream (or other DataOutput implementation) and call its
> writeInt() method.  Or, perhaps you should use an IntBuffer.  What
> are you trying to do?
>

It is going to be a part of a data header, which needs to be of fixed 
length. Also it will contain a value of an offset which cabn't be longer 
than 32-bits. So, I don't care how big int actually is, as long as it is 
big enough to hold 32 bit unsigned value.

I started with serialization, too, but I realized it won't work.

Thanks.

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number to byte[] Askfor <askfor@nowhere.net> - 2015-10-17 10:02 +0200
  Re: number to byte[] Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-17 08:03 -0400
    Re: number to byte[] Askfor <askfor@nowhere.net> - 2015-10-17 23:03 +0200
      Re: number to byte[] Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-17 17:45 -0400
        Re: number to byte[] Askfor <askfor@nowhere.net> - 2015-10-18 12:13 +0200
          Re: number to byte[] Askfor <askfor@nowhere.net> - 2015-10-18 12:44 +0200
            Re: number to byte[] Lew <lewbloch@gmail.com> - 2015-11-29 23:07 -0800
          Re: number to byte[] Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-18 08:40 -0400
      Re: number to byte[] Nigel Wade <nmw@ion.le.ac.uk> - 2015-10-19 10:43 +0100
        Re: number to byte[] Wayne <nospam@all.invalid> - 2015-10-20 00:45 -0400
        Re: number to byte[] Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2015-10-20 13:35 -0700
  Re: number to byte[] Lothar Kimmeringer <news200709@kimmeringer.de> - 2015-10-25 10:22 +0100

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