Groups > comp.lang.java.programmer > #27875

Re: how actually string store in java machine

From	markspace <markspace@nospam.nospam>
Newsgroups	comp.lang.java.programmer
Subject	Re: how actually string store in java machine
Date	2014-03-26 08:32 -0700
Organization	A noiseless patient Spider
Message-ID	<lguruv$1dm$1@dont-email.me> (permalink)
References	<8f7d9272-4b25-44c9-8c31-93ea754be4cb@googlegroups.com> <lgsflf$pua$1@dont-email.me> <lgslfc$k81$1@news.albasani.net> <lgslj6$k81$2@news.albasani.net> <b9f4j99knq24nqdmi1ultckkm82ecem7v6@4ax.com>

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On 3/25/2014 7:37 PM, Roedy Green wrote:
> On Tue, 25 Mar 2014 20:31:50 +0100, Jan Burse <janburse@fastmail.fm>
> wrote, quoted or indirectly quoted someone who said :
>
>>
>> http://stackoverflow.com/questions/16690815/shared-constant-pool
>
> I was under the impression all string constants lived in the same pool
> along with the interned strings. That would imply a shared constant
> pool since day 1.  Have I had this wrong since Java 1.0?
>

Yes, I'm pretty sure you've been wrong if that's what you thought.  Each 
class has its own pool of strings.  If you have a class with a constant 
string:

   String a = "a";
   String b = "a";

The constant "a" is only stored once, and a==b will be true.  But that's 
only for a single class file.  Outside of the class file, each string is 
unique and a different object.  I don't think any implementations of the 
JVM called String.intern() for each constant string read in each class file.

And certainly if you read a string from a file or the network, the VM 
does not call String.intern() for you.  That would be silly.

Thread

how actually string store in java machine Rishipal Singh <95rishipal@gmail.com> - 2014-03-25 09:56 -0700
  Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 10:32 -0700
  Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 10:33 -0700
  Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 13:49 -0400
    Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-25 20:29 +0100
      Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-25 20:31 +0100
        Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 19:37 -0700
          Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-26 09:03 +0100
            Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-26 09:11 +0100
            Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-27 10:27 +0100
          Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-26 08:32 -0700
            Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-26 13:54 -0400
              Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-26 12:57 -0700
              Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-26 16:37 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-27 08:54 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-27 08:23 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-27 11:50 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-28 06:58 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-28 11:02 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-04-02 05:47 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-04-02 10:15 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-04-03 08:58 -0700
            Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-26 17:07 -0700
      Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:07 -0400
        Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:16 -0400
          Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:19 -0400
            Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-25 14:00 -0700
              Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 17:21 -0400
                Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-26 11:40 -0400
                Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-26 17:46 -0700
  Re: how actually string store in java machine Lew <lewbloch@gmail.com> - 2014-03-25 15:07 -0700

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