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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: How to convert image into Hex 2 Dimensional Array?
Date: Wed, 08 May 2013 21:45:13 -0400
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On 5/8/2013 9:04 PM, Arne Vajhøj wrote:
> On 5/8/2013 9:57 AM, lipska the kat wrote:
>> [...] the following two lines are
>> logically equivalent.
>>
>> 1. Byte[][] bytes = new Byte[width][height];
>> 2. byte[][] bytes = new byte[width][length]
>
> Not at all.
>
> You will eventually end up with 1+width*height and 1 objects respectively.

     No; both will generate 1+width objects:

     - One array containing `width' references to other arrays,

     - `width' arrays containing `height' bytes or Byte
       references.

     A *really* stupid coder might use Byte[][] *and* populate
the arrays with `new Byte(value)' repeated `width*height' times;
that would produce `1 + width + width*height' objects in all.
Autoboxers would be unlikely to enter that particular trap --
but even so, a four- to eight-fold memory bloat is not to be
sneezed at.

-- 
Eric Sosman
esosman@comcast-dot-net.invalid