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devel / comp.lang.java.programmer / Re: How do I dereference a static string

SubjectAuthor
* How do I dereference a static stringC.D. Altenburg, Ph.D,
+- How do I dereference a static stringAndreas Leitgeb
+* How do I dereference a static stringe.d.pro...@gmail.com
|`- How do I dereference a static stringArne_Vajhøj
`- How do I dereference a static stringArne_Vajhøj

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How do I dereference a static string

<282053db-e7b9-4f0a-a66c-12f53021fd55n@googlegroups.com>

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Subject: How do I dereference a static string
From: cdalten@gmail.com (C.D. Altenburg, Ph.D,)
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 by: C.D. Altenburg, Ph.D - Thu, 3 Nov 2022 17:05 UTC

Say I have the string

public static string foo = "foo";

can I just do

foo = null;

in order to dereference that string?

Re: How do I dereference a static string

<slrntm7v56.1qde.avl@logic.at>

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From: avl@logic.at (Andreas Leitgeb)
Newsgroups: comp.lang.java.programmer
Subject: Re: How do I dereference a static string
Date: Thu, 3 Nov 2022 17:38:46 -0000 (UTC)
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 by: Andreas Leitgeb - Thu, 3 Nov 2022 17:38 UTC

C.D. Altenburg, Ph.D, <cdalten@gmail.com> wrote:
> Say I have the string
> public static string foo = "foo";
> can I just do
> foo = null;
> in order to dereference that string?

For what you're doing, "unreferencing" might be the better word.

The word from subject "dereferencing" rather denotes access of the
referenced thing, like in System.out.println(foo);

Re: How do I dereference a static string

<240bceee-4aa9-4c13-85e7-de1946350bb4n@googlegroups.com>

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Subject: Re: How do I dereference a static string
From: e.d.programmer@gmail.com (e.d.pro...@gmail.com)
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 by: e.d.pro...@gmail.com - Thu, 3 Nov 2022 19:37 UTC

On Thursday, November 3, 2022 at 1:05:17 PM UTC-4, C.D. Altenburg, Ph.D, wrote:
> Say I have the string
>
> public static string foo = "foo";
>
> can I just do
>
> foo = null;
>
> in order to dereference that string?
That depends what you mean by dereference. If you want to clear the value, sure set to null like that would work. If you mean remove the variable from memory, static values are tied to the class, you'd have to unload the class.
It is still possible but not advisable to have a public static variable which is not final. It's better to make it private static and use accessor methods.

Re: How do I dereference a static string

<tk1itd$n9b$1@gioia.aioe.org>

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From: arne@vajhoej.dk (Arne Vajhøj)
Newsgroups: comp.lang.java.programmer
Subject: Re: How do I dereference a static string
Date: Thu, 3 Nov 2022 19:29:49 -0400
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 by: Arne Vajhøj - Thu, 3 Nov 2022 23:29 UTC

On 11/3/2022 1:05 PM, C.D. Altenburg, Ph.D, wrote:
> Say I have the string
>
> public static string foo = "foo";
>
> can I just do
>
> foo = null;
>
> in order to dereference that string?

It is a valid statement.

But note that Java does not use reference
counting for memory management so setting
references to null when "done" is
very rare in Java (doing it when "ready"
is seen).

Arne

Re: How do I dereference a static string

<tk1lgv$1i5c$1@gioia.aioe.org>

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From: arne@vajhoej.dk (Arne Vajhøj)
Newsgroups: comp.lang.java.programmer
Subject: Re: How do I dereference a static string
Date: Thu, 3 Nov 2022 20:14:23 -0400
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 by: Arne Vajhøj - Fri, 4 Nov 2022 00:14 UTC

On 11/3/2022 3:37 PM, e.d.pro...@gmail.com wrote:
> On Thursday, November 3, 2022 at 1:05:17 PM UTC-4, C.D. Altenburg, Ph.D, wrote:
>> Say I have the string
>>
>> public static string foo = "foo";
>>
>> can I just do
>>
>> foo = null;
>>
>> in order to dereference that string?

> That depends what you mean by dereference. If you want to clear the
> value, sure set to null like that would work. If you mean remove the
> variable from memory, static values are tied to the class, you'd have
> to unload the class.
Note that:

.... foo = "foo";
....
foo = null;

Involves two memory locations.

The variable foo that is a reference and a
String object containing "foo".

Arne

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