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Groups > comp.lang.java.programmer > #17538

Re: automatically initialized to null?

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  To: markspace
From: Mike Winter <usenet@michael-winter.me.invalid>

On 08/08/2012 21:20, markspace wrote:
> On 8/8/2012 12:23 PM, bob smith wrote:
>> I always forget stuff like thisa
>>
>> If I have
>>
>> Bitmap[] bmps = new Bitmap[256];
>>
>> Are all 256 positions automatically initialized to null?
>
> Yes.  I'm sure that's in the JLS someplace.

"[If] there is no array initializer, and [...] a single [array dimension 
expression] appears, a one-dimensional array is created of the specified 
length, and each component of the array is initialized to its default value 
($4.12.5)."
       -- 15.10.1 Run-time evaluation of Array Creation Expressions

"For all reference types ($4.3), the default value is null."
                              -- 4.12.5 Initial Values of Variables

:-)

--
Mike Winter
Replace ".invalid" with ".uk" to reply by e-mail.

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automatically initialized to null? "bob smith" <bob.smith@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
  Re: automatically initialized to null? "markspace" <markspace@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
    Re: automatically initialized to null? "Mike Winter" <mike.winter@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
      Re: automatically initialized to null? "Lew" <lew@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
        Re: automatically initialized to null? "Jim Gibson" <jim.gibson@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
    Re: automatically initialized to null? "bob smith" <bob.smith@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
      Re: automatically initialized to null? "Eric Sosman" <eric.sosman@1:261/38.remove-tos-this> - 2012-08-09 19:46 +0000
        Re: automatically initialized to null? "bob smith" <bob.smith@1:261/38.remove-t9h-this> - 2012-08-10 18:39 +0000
  Re: automatically initialized to null? "Roedy Green" <roedy.green@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000

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