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Groups > comp.lang.java.programmer > #33560
| Subject | Re: Assignment or Initialization? |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| References | (1 earlier) <n8oa1b$tq9$2@dont-email.me> <n8ockg$b4a$1@dont-email.me> <n8of62$ku9$1@dont-email.me> <n8oh2r$svq$1@dont-email.me> <n8oufo$dm7$2@jstuckle.eternal-september.org> |
| From | Wayne <nospam@all.invalid> |
| Message-ID | <KpWry.318375$zT1.100297@fx26.iad> (permalink) |
| Organization | Newshosting.com - Highest quality at a great price! www.newshosting.com |
| Date | 2016-02-01 23:39 -0500 |
On 2/1/2016 7:52 PM, Jerry Stuckle wrote:
> On 2/1/2016 4:03 PM, Eric Sosman wrote:
>> On 2/1/2016 3:31 PM, Knute Johnson wrote:
>>> On 2/1/2016 11:47, Eric Sosman wrote:
>>>> 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.
>>>>
>>>
>>> public class test {
>>> final int i;
>>>
>>> public test() {
>>> i = 666;
>>> }
>>> }
>>>
>>> is perfectly legal and used all the time (by me anyway).
>>
>> That's the case 4ndre4 described: Initialization of a final
>> field in a constructor. But 4ndre4 seemed to be saying that it's
>> the only legal case, and my point was that there are others.
>>
>
> Actually, I believe it is *assignment* in the constructor.
> Initialization would be :
>
> public test() : i(666) {
> }
>
>
That's in C++, not Java!
--
Wayne
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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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