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Groups > comp.lang.java.gui > #4391

Re: Sharing ListSelection

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  To: comp.lang.java.gui
Lew wrote:
>> nit:  the second initialization to 'false' is redundant, as 'false' 
>> is the default value.

John B. Matthews wrote:
> Correct and interesting. I sometimes indulge in gratuitous 
> initialization to signify that the code relies on that initial value 
> (and no other). By analogy, these expressions all evaluate to 10

While it is a nit, it is interesting to me that the compiler and runtime are 
actually forbidden to remove the extra initialization.

JLS 12.5,
<http://java.sun.com/docs/books/jls/third_edition/html/execution.html#12.5>
Just after memory is allocated for the instance,
> all the instance variables in the new object, including those declared in 
> superclasses, are initialized to their default values (-o4.12.5). 
then, initialization procedure step 4 is to
> Execute the instance initializers and instance variable initializers 
> for this class, ... (In some early implementations, the compiler 
> incorrectly omitted the code to initialize a field if the field 
> initializer expression was a constant expression whose value was 
> equal to the default initialization value for its type.) 

-- 
Lew

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Sharing ListSelectionMode "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
  Re: Sharing ListSelection "Sabine Dinis Blochberger" <sabine.dinis.blochberger@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
    Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
      Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
        Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
          Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
            Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
              Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
            Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000

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