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IWETHEY Home / IWETHEY Board / Theory and Practice of Programming Forum / I don't think it will affect speed
Post #25,199
by Arkadiy
Picture of Arkadiy
1/22/02 7:28:44 PM
Reply
New I don't think it will affect speed
but you'll have an extra field per instance if you don't use static. I don't see any reason why not to use it.
Post #25,280
by tuberculosis
Picture of tuberculosis
1/23/02 1:13:14 PM
8/21/07 5:57:47 AM
Reply
New Yep, its a size issue.
Without static, you have an instance variable in every instance that all point to the same string (done by the compiler so that string literals that are equivalent are also indentical). So you pay for 1 object reference per instance of the enclosing class.

If you make it static, you have one object reference, period. So you might save 4 bytes per instance by using static and since its a constant (it *is* a constant, right?) its a more rational way to do things.

The only speed impact would be at object construction time, the cost of initializing the per instance reference to the string. This is likely negligible - I doubt you could measure it without creating 100k objects in a tight loop and measuring the difference.
The average hunter gatherer works 20 hours a week.
The average farmer works 40 hours a week.
The average programmer works 60 hours a week.
What the hell are we thinking?
Expand Edited by tuberculosis Aug. 21, 2007, 05:57:47 AM EDT
Expand All History
     Java String field optimization tips? - (dlevitt) - (33) - Jan. 22, 2002, 12:05:19 PM EST
         Strings shouldn't matter. - (admin) - (9) - Jan. 22, 2002, 01:09:20 PM EST
             JDBC PreparedStatements - (dlevitt) - (8) - Jan. 23, 2002, 03:07:12 PM EST
                 Depends on the database - (admin) - Jan. 23, 2002, 08:12:59 PM EST
                 But back to the main question... - (admin) - (6) - Jan. 23, 2002, 08:14:02 PM EST
                     Yeeha, Scott - (wharris2) - (5) - Jan. 23, 2002, 08:28:00 PM EST
                         Java profiling usually works pretty well - (admin) - (2) - Jan. 23, 2002, 08:41:49 PM EST
                             I believe that, no links required - (wharris2) - Jan. 23, 2002, 08:55:56 PM EST
                             Try: JProbe... -NT - (slugbug) - Jan. 23, 2002, 09:27:03 PM EST
                         Oh I believe it - (drewk) - (1) - Jan. 24, 2002, 10:32:07 AM EST
                             Kinda missing the point... - (admin) - Jan. 24, 2002, 11:03:56 AM EST
         Real world experience - (Yendor) - (18) - Jan. 22, 2002, 01:26:53 PM EST
             (The technical reason) - (wharris2) - (7) - Jan. 22, 2002, 03:49:21 PM EST
                 The technical reason behind the technical reason - (admin) - (6) - Jan. 22, 2002, 06:47:20 PM EST
                     I don't believe it - (ben_tilly) - (5) - Jan. 23, 2002, 01:08:55 PM EST
                         That would help, but.... - (marlowe) - (1) - Jan. 23, 2002, 03:14:25 PM EST
                             The scheme addresses those acceptably well - (ben_tilly) - Jan. 23, 2002, 10:11:39 PM EST
                         Compile time only - (dlevitt) - (2) - Jan. 23, 2002, 03:15:12 PM EST
                             Are you sure? - (marlowe) - Jan. 23, 2002, 03:54:40 PM EST
                             Compile time concatenation - (ChrisR) - Jan. 23, 2002, 04:30:52 PM EST
             Sounds like a shitty compiler. - (tuberculosis) - (9) - Aug. 21, 2007, 06:03:38 AM EDT
                 Wrong, syntactically - (wharris2) - (8) - Jan. 24, 2002, 02:41:50 PM EST
                     Read it again - (tuberculosis) - (7) - Aug. 21, 2007, 06:10:22 AM EDT
                         But what about the general case? - (ben_tilly) - (6) - Jan. 25, 2002, 11:39:03 PM EST
                             Re: But what about the general case? - (tuberculosis) - (5) - Aug. 21, 2007, 06:19:12 AM EDT
                                 (arguing) - (wharris2) - Jan. 29, 2002, 08:58:35 AM EST
                                 I always get dubious... - (ben_tilly) - (3) - Jan. 29, 2002, 10:37:56 AM EST
                                     Don't know why - (tuberculosis) - (2) - Aug. 21, 2007, 06:26:57 AM EDT
                                         Whacky overloading. Yes. -NT - (wharris2) - Jan. 29, 2002, 02:38:09 PM EST
                                         That I will agree with - (ben_tilly) - Jan. 29, 2002, 04:57:20 PM EST
         Depends - (ChrisR) - Jan. 22, 2002, 04:46:41 PM EST
         I don't think it will affect speed - (Arkadiy) - (1) - Jan. 22, 2002, 07:28:44 PM EST
             Yep, its a size issue. - (tuberculosis) - Aug. 21, 2007, 05:57:47 AM EDT
         Re: Java String field optimization tips? - (dshellman) - Feb. 5, 2002, 02:56:42 PM EST

Finito, bay-bee...
57 ms