$30 off During Our Annual Pro Sale. View Details »
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
渋谷Java #3
Search
mystelynx
September 28, 2013
Programming
2
270
渋谷Java #3
guava totallylazy java8
について
mystelynx
September 28, 2013
Tweet
Share
More Decks by mystelynx
See All by mystelynx
Ansible Study #1
mystelynx
1
340
Apache Commonsに関するお話
mystelynx
2
980
Other Decks in Programming
See All in Programming
これだけで丸わかり!LangChain v1.0 アップデートまとめ
os1ma
6
1.3k
俺流レスポンシブコーディング 2025
tak_dcxi
13
7.7k
分散DBって何者なんだ... Spannerから学ぶRDBとの違い
iwashi623
0
170
テストやOSS開発に役立つSetup PHP Action
matsuo_atsushi
0
140
dotfiles 式年遷宮 令和最新版
masawada
1
670
大体よく分かるscala.collection.immutable.HashMap ~ Compressed Hash-Array Mapped Prefix-tree (CHAMP) ~
matsu_chara
1
210
令和最新版Android Studioで化石デバイス向けアプリを作る
arkw
0
110
Querying Design System デザインシステムの意思決定を支える構造検索
ikumatadokoro
1
1.2k
CSC305 Lecture 15
javiergs
PRO
0
240
バックエンドエンジニアによる Amebaブログ K8s 基盤への CronJobの導入・運用経験
sunabig
0
130
Navigation 3: 적응형 UI를 위한 앱 탐색
fornewid
1
120
Building AI Agents with TypeScript #TSKaigiHokuriku
izumin5210
6
1.2k
Featured
See All Featured
Testing 201, or: Great Expectations
jmmastey
46
7.8k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.2k
Thoughts on Productivity
jonyablonski
73
5k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
12
960
How GitHub (no longer) Works
holman
316
140k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
Documentation Writing (for coders)
carmenintech
76
5.2k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
333
22k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
31
3k
Optimising Largest Contentful Paint
csswizardry
37
3.5k
Navigating Team Friction
lara
191
16k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
128
54k
Transcript
Java8ɺͪΐͬͱͦͷલʹ ौ୩Java #3 Urakawa Tomohiro / @mystelynx 139݄28༵
ࣗݾհ Urakawa Tomohiro @mystelynx ؋ୂ࢘ྩ෦Level.19 ΫοΩʔ͞Μଔۀ͠·ͨ͠ɻ גࣜձࣾALBERTɹγεςϜ։ൃ෦ ࠷ۙRedshiftͱٔΕ͍ͯ·͢ɻ 139݄28༵
Agenda JavaͰ͑ΔؔܕϥΠϒϥϦ guava-libraries totallylazy ͦΕͧΕͷ༻্ͷҙɾ༻๏ʗ༻ྔͳͲ Java8ͱซ༻͢Δͱʁ 139݄28༵
139݄28༵
guava-libraries https:/ /code.google.com/p/guava-libraries/ ࠷৽όʔδϣϯɿ15.0 (2013/09/06) υΩϡϝϯτ͕݁ߏࡉ͔͘ॻ͔Ε͍ͯΔ ศརͳCollectionUtilitiesͳͲؚΜͰ͍Δ ࠓճؔܕϓϩάϥϛϯάػೳʹ 139݄28༵
ίʔυྫ̍ ݁ߏͬͨΒ͍͠ʢओ؍ 139݄28༵
ίʔυྫ̎ ͔ͦ͜ͱͳ͘υϠײΛײ͡Δʢओ؍ 139݄28༵
ॴײ CharMatcherͳͲᙱ͍ͱ͜Ζʹख͕ಧ͘ ແବʹ࣮͠ͳ͍ͨΊʹɺԿ͕༻ҙ͞Ε ͯΔ͔େମѲ͓ͯ͜͠͏ શମతʹΫϥεʗϝιου໊ΛۃྗΘ͔Γ ͘͢͠Α͏ͱͯ͘͠Ε͍ͯΔײ͕͋Δɻ ٯʹ͔Γʹ͍͘ʁʢmapͩΖ…ͱ͔ʣ 139݄28༵
ҙ Java8ͷඪ४ϥΠϒϥϦͱΫϥε໊͕ඃΔ java.util.function.Function vs com.google.common.base.Function java.util.function.Predicate vs com.google.common.base.Predicate ඍົʹϝιου໊͕׳Εͳ͍ 139݄28༵
139݄28༵
totallylazy https:/ /code.google.com/p/totallylazy/ ࠷৽όʔδϣϯɿ1113 (2013/08/25) υΩϡϝϯτແ͍ʢʀ∀ʀʣ ιʔεʂˠJavaDocແ͍ʢʀ∀ʀʣɹɹɹ ςετˠཏ͞Εͯͳ͍ʢʀ∀ʀʣ 139݄28༵
ઃܭࢥతʹ ClojureͷCollectionͷ༷ʹՄೳͳݶΓԆධՁ MLܥݴޠͷ໊ؔʗϝιου໊Λ౿ऻ HaskellScalaܦݧऀೃછΈ͍͔͢ HamcrestͷMatcherΛPredicateʹ͑Δ static importଟ༻ 139݄28༵
ίʔυྫ̍ େےguavaͱมΘΒͳ͍ɻ mapͱ͔filterͱ͔static import͞Εͯ·͢ 139݄28༵
ίʔυྫ̎ υϠ ιʔεΛݟͳ͕ΒؤுΔ͔͠ͳ͍ؾ͕͢Δ sequence(foo)͕ɺJava8ͷStreamͷΠϝʔδ 139݄28༵
ॴײ ͱʹ͔͘υΩϡϝϯτ͕ແ͍ ઓಆྗͷ͕ܹ͍ࠩ͠ هड़ͱʹ͔͘؆ܿɻJava8ͷϥϜμࣜͰॻ͘ ΑΓ؆ܿɻ 139݄28༵
ҙ Java8ͷඪ४ϥΠϒϥϦͱΫϥε໊͕ඃΔ com.googlecode.totallylazy.Predicate newͰΠϯελϯεੜ͢ΔͷͰͳ ͘ɺSequences, PredicatesͳͲͳͲ͔Β static importͯ͠͏ͷ͕ఆੴ eclipseͩͱ͠ΜͲ͍Πϝʔδʢओ؍ 139݄28༵
139݄28༵
Java8 https:/ /jdk8.java.net/download.html ࠷৽όʔδϣϯɿ8 build b108 2014/03ϦϦʔε༧ఆʂ ؔܕػೳͷଞʹDateTimeͱ͔ɺσϑΥϧ τϝιουͱ͔ 139݄28༵
ίʔυྫ̍ ͜ͷॻ͖ํ͢ΔͱͲΕมΘΒͳ͍Ͱ͢Ͷ 139݄28༵
ίʔυྫ̎ ͜Ε͕Ұ൪͍ؾ͕͢Δ stream()ͯ͠ɺ࠷ޙʹList͢ ϥϜμࣜ͏ͱnew new͠ͳ͍͍ͯ͘ͷͰݟ ͍͢ 139݄28༵
͍ͭͰʹ guava/totallylazyͦΕͧΕϥϜμࣜͰ guava؆ܿʹͳͬͯGood totallylazyʹͳͬͯBad 139݄28༵
·ͱΊ Ϋϥε໊͕ඃͬͯ͘ΔͷͰɺҙ͠Α͏ totallylazy͑Δͱγϯϓϧ ˞ʮ͑Δͱʯ guavaίϨΫγϣϯϢʔςΟϦςΟͳͲ ͳ͑͘Δ 139݄28༵
͓ΘΓ 139݄28༵