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Java-Scala interoperability - April 2016

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April 19, 2016
Programming
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Java-Scala interoperability - April 2016

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

April 19, 2016
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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