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Groups > comp.lang.java.programmer > #24926
| From | Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Cost of creating objects? |
| Organization | N/A |
| References | (1 earlier) <code-review-20130807173646@ram.dialup.fu-berlin.de> <ktu1eu$dbt$1@news.albasani.net> <ktu8h4$ftf$1@dont-email.me> <d0ae8f7d-89a1-44f8-ac8c-8c7e9038dc1e@googlegroups.com> <ktuq3e$amp$1@dont-email.me> |
| Message-ID | <lvd2pobne0.fsf@saunalahti.fi> (permalink) |
| Date | 2013-08-08 11:24 +0300 |
Eric Sosman <esosman@comcast-dot-net.invalid> writes:
> On 8/7/2013 7:52 PM, Lew wrote:
>> Overrule him. He's an idiot. Although doing a 'containsKey()' before a
>> get()' is silly.
> Situation: A Map that is searched for keys that are usually
> *not* present (poor man's Bloom filter, say), and some of whose
> mapped values are null. Now, attend:
> if (map.containsKey(key)) { // usually false
> Value val = map.get(key); // seldom needed
> ...
> }
> vs.
> Value val = map.get(key);
> if (val == null // usually true
> || map.containsKey(key) // usually false
> ) {
I think you mean
Value val = map.get(key);
if (val != null // usually false
|| map.containsKey(key)) { // usually false
--
Jukka Lahtinen
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Cost of creating objects? Sebastian <news@seyweiler.dyndns.org> - 2013-08-07 09:44 +0200
Re: Cost of creating objects? Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-08-07 13:02 +0300
Re: Cost of creating objects? Sebastian <news@seyweiler.dyndns.org> - 2013-08-07 12:05 +0200
Re: Cost of creating objects? Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-08-07 14:08 +0300
Re: Cost of creating objects? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-08-07 08:08 -0400
Re: Cost of creating objects? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2013-08-07 20:14 -0700
Re: Cost of creating objects? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-08-08 17:17 -0300
Re: Cost of creating objects? Joerg Meier <joergmmeier@arcor.de> - 2013-08-07 12:37 +0200
Re: Cost of creating objects? Sebastian <news@seyweiler.dyndns.org> - 2013-08-07 19:51 +0200
Re: Cost of creating objects? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-08-07 15:51 -0400
Re: Cost of creating objects? Lew <lewbloch@gmail.com> - 2013-08-07 16:52 -0700
Re: Cost of creating objects? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-08-07 20:51 -0400
Re: Cost of creating objects? Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2013-08-08 11:24 +0300
Re: Cost of creating objects? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-08-08 10:07 +0100
Re: Cost of creating objects? Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2013-08-08 17:34 +0300
Re: Cost of creating objects? Arne Vajhøj <arne@vajhoej.dk> - 2013-08-08 10:42 -0400
Re: Cost of creating objects? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-08-08 20:45 +0100
Re: Cost of creating objects? Arne Vajhøj <arne@vajhoej.dk> - 2013-08-08 10:38 -0400
Re: Cost of creating objects? Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-08-08 10:13 -0400
Re: Cost of creating objects? Arne Vajhøj <arne@vajhoej.dk> - 2013-08-07 20:28 -0400
Re: Cost of creating objects? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-08-08 17:34 -0300
Re: Cost of creating objects? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-08-07 19:19 +0100
Re: Cost of creating objects? lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-08-07 19:24 +0100
Re: Cost of creating objects? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2013-08-07 20:03 -0700
Re: Cost of creating objects? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-08-08 17:39 -0300
Re: Cost of creating objects? Arne Vajhøj <arne@vajhoej.dk> - 2013-08-07 20:24 -0400
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