Groups > comp.lang.java.programmer > #18410

Re: startup code

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From	Eric Sosman <esosman@ieee-dot-org.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: startup code
Date	Wed, 29 Aug 2012 15:41:36 -0400
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On 8/29/2012 2:58 PM, Patricia Shanahan wrote:
> On 8/29/2012 11:18 AM, bob smith wrote:
>> On Wednesday, August 29, 2012 10:28:09 AM UTC-5, Patricia Shanahan wrote:
>>> On 8/29/2012 8:14 AM, bob smith wrote:
>>>
>>> ...
>>>
>>>> I have a font class, and it needs to load a bitmap containing the
>>>> fonts.
>>>
>>>
>>>
>>> When do you need the bitmap? For example, it might be needed on first
>>>
>>> call to some static method in the class, or the first time an instance
>>>
>>> of the class is created ...
>>>
>>>
>>>
>>> Patricia
>>
>> On first call to some static method in the class
>>
>
> In that case, put the initialization in a static initializer:
>
> static {
>    // create the bitmap
> }
>
> It will be run on the first event that causes initialization of the
> class. Invocation of a static method is one of those events.

     "What she said," with a stylistic suggestion: If the code to
create the bitmap grows to more than a very few lines, consider
putting them in a private static method of their own and calling
that method from the static initializer:

	class Thing {
	    ...
	    static {
	        createTheBitmap();
	    }

	    /** Called only during class initialization. */
	    private static void createTheBitmap() {
	        // create the bitmap
	    }
	    ...
	}

Doesn't change the code's meaning in any significant way, but
may make it easier to debug/adapt/refactor later on.

-- 
Eric Sosman
esosman@ieee-dot-org.invalid

Thread

startup code bob smith <bob@coolfone.comze.com> - 2012-08-28 11:48 -0700
  Re: startup code Roedy Green <see_website@mindprod.com.invalid> - 2012-08-28 11:53 -0700
    Re: startup code Lew <lewbloch@gmail.com> - 2012-08-28 14:00 -0700
      Re: startup code Robert Klemme <shortcutter@googlemail.com> - 2012-08-28 23:48 +0200
        Re: startup code Lew <lewbloch@gmail.com> - 2012-08-28 15:25 -0700
        Re: startup code Patricia Shanahan <pats@acm.org> - 2012-08-29 08:27 -0700
          Re: startup code bob smith <bob@coolfone.comze.com> - 2012-08-29 11:18 -0700
            Re: startup code Patricia Shanahan <pats@acm.org> - 2012-08-29 11:58 -0700
              Re: startup code Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-29 15:41 -0400
                Re: startup code Lew <lewbloch@gmail.com> - 2012-08-29 13:04 -0700
                Re: startup code Robert Klemme <shortcutter@googlemail.com> - 2012-08-29 22:06 +0200
                Re: startup code Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-29 17:14 -0400
      Re: startup code Roedy Green <see_website@mindprod.com.invalid> - 2012-08-29 00:21 -0700
        Re: startup code Patricia Shanahan <pats@acm.org> - 2012-08-29 02:42 -0700
          Re: startup code Patricia Shanahan <pats@acm.org> - 2012-08-29 02:54 -0700
    Re: startup code Arne Vajhøj <arne@vajhoej.dk> - 2012-08-28 19:20 -0400
  Re: startup code Jeff Higgins <jeff@invalid.invalid> - 2012-08-28 15:22 -0400
  Re: startup code Arne Vajhøj <arne@vajhoej.dk> - 2012-08-28 19:19 -0400

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