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Re: how actually string store in java machine

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On 3/26/2014 7:37 PM, markspace wrote:
> On 3/26/2014 10:54 AM, Eric Sosman wrote:
>
>> ... prints
>>
>>      Foo.HELLO == "Hello": true
>>
>> ... on my Java 1.7.0_51 system.  You might also want to re-read
>> Section 3.10.5 of the Java Language Specification; for Java 7 and 8
>> it reads (in part)
>
>
> Well, that I did not expect.  No wonder it takes so long to load a class
> if each class has to be parsed for string literals and each one added to
> a hash map someplace.

     There's surely no parsing to speak of. The string literals'
data arrives in the class' constant pool, along with a lot of
other stuff, and is pretty easily located therein.  I suspect
that the time required to fish them out and intern() them is
peanuts compared to the time spent on the rest of class loading
and initialization (but I have absolutely no data to support my
suspicion).  And then there's the JIT ...

> Grrr, I'm actually mad about that.  String are *required* to be
> intern'd?!  That's really funky.

     I think so, too.  It feels like an implementation detail
that might better have been left unspecified.  Similarly, I
feel that the span of pooled Integer and suchlike objects ought
not to be part of the language definition, but should have been
left to the discretion of a JVM's implementors.

-- 
Eric Sosman
esosman@comcast-dot-net.invalid

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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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