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Re: How to convert image into Hex 2 Dimensional Array?

From Daniel Pitts <newsgroup.nospam@virtualinfinity.net>
Newsgroups comp.lang.java.programmer
Subject Re: How to convert image into Hex 2 Dimensional Array?
References <41718873-b1a6-4b97-bbbb-8002c48d4e29@googlegroups.com> <GKCdnX3n1aHvmhfMnZ2dnUVZ8s6dnZ2d@bt.com> <kmdj5i$sk9$1@dont-email.me> <iqudnf7mvqsqxBfMnZ2dnUVZ7tSdnZ2d@bt.com>
Message-ID <_4uit.18441$MS1.11557@newsfe05.iad> (permalink)
Date 2013-05-08 08:22 -0700

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On 5/8/13 6:57 AM, lipska the kat wrote:
> On 08/05/13 14:19, Daniele Futtorovic wrote:
>> On 08/05/2013 10:06, lipska the kat allegedly wrote:
>>>        Byte[][] bytes = new Byte[width][height];
>>
>> Lipska, mind the difference between Byte and byte. That code above is
>> extremely bad advice.
>
> Why? it's common practice these days to eschew primitives and use
> (autoboxing) classes
Common practice where? Cite a credible source or I'll be forced to think 
that you are just making up facts to support your mistake.  My 4 year 
old daughter does that; you want to be more credible than my 4 year old, 
don't you?

> it's more consistent in OO code and, as I
> understand things, post autoboxing, the following two lines are
> logically equivalent.
>
> 1. Byte[][] bytes = new Byte[width][height];
> 2. byte[][] bytes = new byte[width][length]

Even ignoring the typos, those are nothing alike.

Auto-boxing is a convenience, but does not make those two things the 
same, even by a long shot.

byte cannot contain a NULL reference. It contains no reference 
whatsoever. Byte on the other hand *can* contain a reference.

byte[] is *not* assignable to Byte[], and Byte[] is *not* assignable to 
byte[].

You also cannot use arrayCopy to copy between the two.

Boxing and Unboxing (whether manual or automatic) *does* have a cost. It 
may be minimal, and shouldn't be the only consideration.  It should 
however be noted and considered as part of the choice.

Personally my decision on whether to use Byte vs byte would hinge solely 
on the question "do I want to store nulls in this?"

Also, I would likely wrap that primitive value in a semantic class. I 
still lament that Java doesn't have "value types" other than the 
predefined primitives, but I have learned to be "okay" with that.

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Thread

How to convert image into Hex 2 Dimensional Array? sout saret <saretmis097@gmail.com> - 2013-05-07 23:30 -0700
  Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 09:06 +0100
    Re: How to convert image into Hex 2 Dimensional Array? Joerg Meier <joergmmeier@arcor.de> - 2013-05-08 12:29 +0200
      Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 13:28 +0100
    Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-08 15:19 +0200
      Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 14:57 +0100
        Re: How to convert image into Hex 2 Dimensional Array? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-05-08 08:22 -0700
          Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 17:03 +0100
            Re: How to convert image into Hex 2 Dimensional Array? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-05-08 13:44 -0700
          Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 17:48 +0100
            Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-08 21:10 -0400
          Re: How to convert image into Hex 2 Dimensional Array? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-05-08 12:52 -0400
        Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-08 17:32 +0200
          Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 17:17 +0100
            Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-08 18:46 +0200
              Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 18:25 +0100
                Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-08 23:24 +0200
        Re: How to convert image into Hex 2 Dimensional Array? Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2013-05-08 11:46 -0500
        Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-08 21:04 -0400
          Re: How to convert image into Hex 2 Dimensional Array? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-05-08 21:45 -0400
            Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-08 21:59 -0400
              Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-08 22:03 -0400
                Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-09 04:09 +0200
                Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-09 04:09 +0200
                Re: How to convert image into Hex 2 Dimensional Array? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-05-08 23:18 -0400
                Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-09 22:05 -0400
                Re: How to convert image into Hex 2 Dimensional Array? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-05-10 09:46 -0700
                Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-10 19:02 +0200
                Re: How to convert image into Hex 2 Dimensional Array? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-05-10 11:00 -0700
                Re: How to convert image into Hex 2 Dimensional Array? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-05-10 23:42 +0200
                Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-10 18:20 -0400
    Re: How to convert image into Hex 2 Dimensional Array? Jeff Higgins <jeff@invalid.invalid> - 2013-05-08 12:43 -0400
      Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 18:45 +0100
  Re: How to convert image into Hex 2 Dimensional Array? Jeff Higgins <jeff@invalid.invalid> - 2013-05-08 11:18 -0400
  Re: How to convert image into Hex 2 Dimensional Array? Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2013-05-08 11:52 -0500
    Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 18:40 +0100
      Re: How to convert image into Hex 2 Dimensional Array? Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2013-05-08 13:54 -0500
        Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-08 20:43 +0100
        Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-11 09:28 +0100
          Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-11 08:50 -0400
            Re: How to convert image into Hex 2 Dimensional Array? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-11 15:00 +0100
              Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-12 21:45 -0400
  Re: How to convert image into Hex 2 Dimensional Array? Manuel Dahmen <manuel.dahmen@gmail.com> - 2013-05-08 15:38 -0700
  Re: How to convert image into Hex 2 Dimensional Array? Roedy Green <see_website@mindprod.com.invalid> - 2013-05-11 13:33 -0700
    Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-12 21:48 -0400
      Re: How to convert image into Hex 2 Dimensional Array? markspace <markspace@nospam.nospam> - 2013-05-12 20:49 -0700
        Re: How to convert image into Hex 2 Dimensional Array? Arne Vajhøj <arne@vajhoej.dk> - 2013-05-13 19:08 -0400
        Re: How to convert image into Hex 2 Dimensional Array? Roedy Green <see_website@mindprod.com.invalid> - 2013-05-15 03:45 -0700
        Re: How to convert image into Hex 2 Dimensional Array? Roedy Green <see_website@mindprod.com.invalid> - 2013-05-15 03:50 -0700

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