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Groups > comp.lang.java.programmer > #39954

Re: switch is shared declaration

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> > I don't use a lot of switches so I hadn't realized this but: 
> > this is invalid: 
> > if (1==1) { 
> > String s; 
> > } else { 
> > s = "1"; 
> > } 
> > 
> > but this is fine: 
> > switch (1) { 
> > case -1: 
> > String s; 
> > break; 
> > case 1: 
> > s = "1"; 
> > break; 
> > }
> The entire switch sort of has to be a single scope due to 
> fall through (no break) being valid. 
> 
> Arne

I guess it makes sense. You could call it a soft scope? In the if statement you get an undeclared variable error as it knows the if block will never execute with the else condition. In the switch statement it also will never execute both the declaration and the assignment, unless you remove the break. Since the break it optional, the compile sees it as one, though it also executes fine.

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switch is shared declaration "e.d.pro...@gmail.com" <e.d.programmer@gmail.com> - 2023-05-24 05:15 -0700
  Re: switch is shared declaration Arne Vajhøj <arne@vajhoej.dk> - 2023-05-24 12:57 -0400
    Re: switch is shared declaration Arne Vajhøj <arne@vajhoej.dk> - 2023-05-24 13:16 -0400
    Re: switch is shared declaration "e.d.pro...@gmail.com" <e.d.programmer@gmail.com> - 2023-05-24 11:05 -0700
      Re: switch is shared declaration Michael Jung <miju@golem.phantasia.org> - 2023-05-28 12:57 +0200
  Re: switch is shared declaration Marcel Mueller <news.5.maazl@spamgourmet.org> - 2023-05-28 13:31 +0200
    Re: switch is shared declaration Eric Sosman <esosman@comcast-dot-net.invalid> - 2023-05-28 08:36 -0400
      Re: switch is shared declaration Marcel Mueller <news.5.maazl@spamgourmet.org> - 2023-05-28 15:16 +0200
        Re: switch is shared declaration Arne Vajhøj <arne@vajhoej.dk> - 2023-05-28 13:42 -0400
      Re: switch is shared declaration Arne Vajhøj <arne@vajhoej.dk> - 2023-05-28 13:43 -0400

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