Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Java-Scala interoperability - April 2016

Avatar for sullis sullis
April 19, 2016
Programming
0
370

Java-Scala interoperability - April 2016

Java-Scala interoperability
Portland Java User Group
April 19, 2016

Avatar for sullis

sullis

April 19, 2016
Tweet

More Decks by sullis

See All by sullis
Dependency Management for Java - Seattle 2025-11-18
Avatar for sullis sullis
0
22
Dependency Management for Java - Portland - 2025-11-04
Avatar for sullis sullis
0
17
Dependency management for Java applications 2025-09-11
Avatar for sullis sullis
0
25
S3 NYC Iceberg meetup 2025-07-10
Avatar for sullis sullis
0
50
Amazon S3 Chicago 2025-06-04
Avatar for sullis sullis
0
120
Amazon S3 Boston 2025-05-07
Avatar for sullis sullis
0
93
Netty ConFoo Montreal 2025-02-27
Avatar for sullis sullis
0
130
GitHub Actions ConFoo Montreal 2025-02-26
Avatar for sullis sullis
0
93
Netty Portland Java User Group 2025-02-18
Avatar for sullis sullis
0
31

Other Decks in Programming

See All in Programming
Kotlin Multiplatform Meetup - Compose Multiplatform 외부 의존성 아키텍처 설계부터 운영까지
Avatar for Suhyeon Kim wisemuji
0
190
CSC307 Lecture 04
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
660
20260127_試行錯誤の結晶を1冊に。著者が解説 先輩データサイエンティストからの指南書 / author's_commentary_ds_instructions_guide
Avatar for nash_efp nash_efp
0
910
Smart Handoff/Pickup ガイド - Claude Code セッション管理
Avatar for rasshii yukiigarashi
0
130
Fragmented Architectures
Avatar for Denys Poltorak denyspoltorak
0
150
フルサイクルエンジニアリングをAI Agentで全自動化したい 〜構想と現在地〜
Avatar for Kaito Minatoya kamina_zzz
0
400
MUSUBIXとは
Avatar for Hisaho nahisaho
0
130
AWS re:Invent 2025参加 直前 Seattle-Tacoma Airport(SEA)におけるハードウェア紛失インシデントLT
Avatar for tetutetu214 tetutetu214
2
100
組織で育むオブザーバビリティ
Avatar for ryotaro kobayashi ryota_hnk
0
170
CSC307 Lecture 06
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
680
CSC307 Lecture 07
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
550
今こそ知るべき耐量子計算機暗号(PQC)入門 / PQC: What You Need to Know Now
Avatar for mackey0225 mackey0225
3
370

Featured

See All Featured
Dominate Local Search Results - an insider guide to GBP, reviews, and Local SEO
Avatar for Greg Gifford greggifford
PRO
0
77
How to Think Like a Performance Engineer
Avatar for Harry Roberts csswizardry
28
2.4k
HU Berlin: Industrial-Strength Natural Language Processing with spaCy and Prodigy
Avatar for Ines Montani inesmontani
PRO
0
200
Reality Check: Gamification 10 Years Later
Avatar for Sebastian Deterding codingconduct
0
2k
Navigating Algorithm Shifts & AI Overviews - #SMXNext
Avatar for Aleyda Solis aleyda
0
1.1k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
Avatar for Joe Casabona jcasabona
34
2.6k
Music & Morning Musume
Avatar for Bryan Veloso bryan
47
7.1k
Embracing the Ebb and Flow
Avatar for Simon Collison colly
88
5k
16th Malabo Montpellier Forum Presentation
Avatar for AKADEMIYA2063 akademiya2063
PRO
0
47
Git: the NoSQL Database
Avatar for Brandon Keepers bkeepers
PRO
432
66k
Thoughts on Productivity
Avatar for Jon Yablonski jonyablonski
74
5k
Navigating the Design Leadership Dip - Product Design Week Design Leaders+ Conference 2024
Avatar for Andy Polaine apolaine
0
170

Transcript

  1. Java-Scala interoperability Sean Sullivan April 19, 2016 Portland Java User

    Group

  2. • software engineer • 20 years Java • 5 years

    at Gilt • back office systems @ Gilt About me

  3. • Scala @ Gilt.com • Scala on the Java VM

    • code examples Agenda

  4. www.gilt.com

  5. https://www.gilt.com/checkout

  6. None

  7. “The Scala 2.11.x series targets Java 6" http://www.scala-lang.org/news/2.11.0/

  8. http://scala-lang.org/news/2.12-roadmap/ “The official Scala 2.12 distribution will be built for

    Java 8 (and thus require it)”

  9. Scala case classes and JSP’s

  10. case class Thing( name: String, color: String)

  11. thing.jsp <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <html> <body> <c:out value=“${myThing.name}”/>

    </body> </html>

  12. JSP expression language expects a JavaBean with “getter” methods

  13. import scala.reflect.BeanProperty case class Thing( @BeanProperty name: String, @BeanProperty color:

    String) @BeanProperty annotation

  14. Collections

  15. None

  16. • convert java.util.List to Scala collection • convert java.util.Set to

    Scala collection • convert java.util.Map to Scala collection • convert Scala List to java.util.List Common scenarios

  17. import scala.collection.JavaConverters._

  18. import java.util.{ArrayList => JArrayList}
 import scala.collection.JavaConverters._
 
 val jArrayList =

    new JArrayList[String]
 jArrayList.add("a")
 jArrayList.add("b")
 jArrayList.add("c")
 
 val scalaList = jArrayList.asScala
 
 scalaList should be (List("a", "b", "c"))


  19. Google Guava library

  20. • com.google.common.base.Optional • com.google.common.util.concurrent.ListenableFuture

  21. Guava @ Gilt

  22. Guava Optional -> Scala Option Scala Option -> Guava Optional

  23. import com.gilt.gfc.guava.GuavaConverters._

  24. Guava Future -> Scala Future Scala Future -> Guava Future

  25. import com.gilt.gfc.guava.future.FutureConverters._

  26. Java 8

  27. https://github.com/scala/scala-java8-compat

  28. import scala.compat.java8.FutureConverters._ Java 8 Future to Scala Future

  29. import scala.compat.java8.OptionConverters._ java.util.Optional to scala.Option

  30. https://github.com/sullis/java-scala-interop-examples

  31. The end

  32. None