Groups > comp.lang.java.programmer > #33552

Re: Assignment or Initialization?

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From	Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Assignment or Initialization?
Date	Mon, 1 Feb 2016 14:47:58 -0500
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On 2/1/2016 2:03 PM, 4ndre4 wrote:
> On 01/02/2016 12:23, Stefan Ram wrote:
>
> [...]
>> final int i;
>> i = 3;
>
> This is illegal.
>
> final int i = 3;
>
> is the correct form: initialization. You can't declare a final variable
> and THEN assign a value to it, unless you are in a constructor, in which
> case it's still an initialization.

     What you say is true (I think) if `i' is a class member.
But it's untrue for local variables, where constructs like

             final boolean leftClick;
             switch (mouseEvent.getButton()) {
                case MouseEvent.BUTTON1:
                   leftClick = true;
                   break;
                case MouseEvent.BUTTON3:
                   leftClick = false;
                   break;
                default:
                   // Unidentifiable mouse button: Ignore.
                   return;
             }

... work exactly as one would expect: `leftClick' is given only
one value and is thereafter immutable, but the value comes from one
of two (in this case) assignment statements.

     Whether this is counts as an "assignment" or as an "initialization"
is not something I lose sleep over.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

Thread

Re: Assignment or Initialization? 4ndre4 <4ndre4@4ndre4.com.invalid> - 2016-02-01 19:03 +0000
  Re: Assignment or Initialization? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-02-01 14:47 -0500
    Re: Assignment or Initialization? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-02-01 12:31 -0800
      Re: Assignment or Initialization? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-02-01 16:03 -0500
        Re: Assignment or Initialization? Jerry Stuckle <jstucklex@attglobal.net> - 2016-02-01 19:52 -0500
          Re: Assignment or Initialization? Arne Vajhøj <arne@vajhoej.dk> - 2016-02-01 20:46 -0500
          Re: Assignment or Initialization? Wayne <nospam@all.invalid> - 2016-02-01 23:39 -0500
            Re: Assignment or Initialization? Jerry Stuckle <jstucklex@attglobal.net> - 2016-02-02 09:14 -0500
      Re: Assignment or Initialization? 4ndre4 <4ndre4@4ndre4.com.invalid> - 2016-02-02 19:25 +0000
  Re: Assignment or Initialization? Eric Douglas <e.d.programmer@gmail.com> - 2016-02-01 13:13 -0800
    Re: Assignment or Initialization? 4ndre4 <4ndre4@4ndre4.com.invalid> - 2016-02-02 19:26 +0000
  Re: Assignment or Initialization? Arne Vajhøj <arne@vajhoej.dk> - 2016-02-01 20:55 -0500
    Re: Assignment or Initialization? 4ndre4 <4ndre4@4ndre4.com.invalid> - 2016-02-02 19:29 +0000
      Re: Assignment or Initialization? Eric Douglas <e.d.programmer@gmail.com> - 2016-02-02 11:44 -0800
        Re: Assignment or Initialization? Lew <lewbloch@gmail.com> - 2016-02-02 13:16 -0800
      Re: Assignment or Initialization? Lew <lewbloch@gmail.com> - 2016-02-02 13:15 -0800
      Re: Assignment or Initialization? Arne Vajhøj <arne@vajhoej.dk> - 2016-02-02 18:13 -0500
      Re: Assignment or Initialization? Silvio <silvio@internet.com> - 2016-02-03 12:10 +0100
        Re: Assignment or Initialization? Eric Douglas <e.d.programmer@gmail.com> - 2016-02-03 05:14 -0800
          Re: Assignment or Initialization? Lew <lewbloch@gmail.com> - 2016-02-03 13:39 -0800
  Re: Assignment or Initialization? Lew <lewbloch@gmail.com> - 2016-02-02 10:32 -0800
    Re: Assignment or Initialization? 4ndre4 <4ndre4@4ndre4.com.invalid> - 2016-02-02 19:22 +0000
  Re: Assignment or Initialization? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2016-02-03 09:03 -0800

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