Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.java.programmer > #35370
| From | Arne Vajhøj <arne@vajhoej.dk> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: XML |
| Date | 2016-08-16 21:37 -0400 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <np0f3u$1kfc$1@gioia.aioe.org> (permalink) |
| References | (13 earlier) <nonsuv$425$1@gioia.aioe.org> <9c174795-1c98-46f0-bbac-179581cd39a2@googlegroups.com> <novr71$8j0$1@dont-email.me> <6eae6f69-b51d-4e1a-9308-fb68fc735db8@googlegroups.com> <novv42$12m6$1@gioia.aioe.org> |
On 8/16/2016 5:04 PM, Arne Vajhøj wrote:
> Note that you can convert data to a TreeMap using streams
> and lambdas if you really need fast lookup by key.
Demo (well - it is converting to HashMap I think):
Previous code:
// search
Data o1 = data2.getList().stream().filter(item -> item.getIv() ==
456).findFirst().get();
Data o2 = data2.getList().stream().filter(item -> item instanceof DataA
&& ((DataA)item).getSv().equals("ABC")).findFirst().get();
Map code:
// search
Map<Integer, Data> lookupByIv =
data2.getList().stream().collect(Collectors.toMap(item -> item.getIv(),
item -> item));
Map<String, Data> lookupBySv = data2.getList().stream().filter(item ->
item instanceof DataA).map(item ->
(DataA)item).collect(Collectors.toMap(item -> item.getSv(), item -> item));
Data o1 = lookupByIv.get(456);
Data o2 = lookupBySv.get("ABC");
Arne
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
XML Eric Douglas <e.d.programmer@gmail.com> - 2016-07-29 13:25 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-07-29 19:46 -0400
Re: XML Roedy Green <inquiry@mindprod.com> - 2016-07-30 17:09 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-07-30 21:49 -0400
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-07-30 22:35 -0400
Re: XML Roedy Green <inquiry@mindprod.com> - 2016-07-31 21:39 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-01 05:19 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-01 08:51 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-05 06:07 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-05 10:17 -0700
Re: XML Stanimir Stamenkov <s7an10@netscape.net> - 2016-08-07 19:04 +0300
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-08 05:38 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-08 07:19 -0700
Re: XML Stanimir Stamenkov <s7an10@netscape.net> - 2016-08-09 23:57 +0300
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-10 05:37 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-10 10:39 -0700
Re: XML Stanimir Stamenkov <s7an10@netscape.net> - 2016-08-10 22:05 +0300
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-10 13:29 -0700
Re: XML Stanimir Stamenkov <s7an10@netscape.net> - 2016-08-11 02:18 +0300
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-11 05:15 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-11 05:50 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-11 12:24 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-13 15:38 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-16 11:49 -0700
Re: XML Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-16 15:57 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-16 13:20 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-16 17:04 -0400
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-16 21:37 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-17 05:22 -0700
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-17 05:21 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-16 16:13 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-16 13:22 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-16 16:53 -0400
Re: XML Eric Douglas <e.d.programmer@gmail.com> - 2016-08-16 13:32 -0700
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-16 16:47 -0400
Re: XML Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-16 16:59 -0400
Re: XML Arne Vajhøj <arne@vajhoej.dk> - 2016-08-01 08:46 -0400
csiph-web