Introduction to Scala for Java Developers
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The document summarizes a Scala for Java developers meetup that covered why Scala, an introduction to basic Scala concepts, and a quick demo of Akka actors. Some key differences between Scala and Java highlighted include Scala's support for both object-oriented and functional programming, its ability to reduce lines of code through type inference, and its treatment of functions and numbers as objects. The meetup also covered Scala classes, case classes, pattern matching, traits, generics, and the Akka framework for building highly concurrent distributed applications on the JVM.
Introduction to Scala for Java Developers
- 1. ~ Scala for the impatient Java Developer ~ Meetup By : 9 MARCH 2016
- 2. ~ Agenda ~ • Why Scala (imperative Vs. functional programming) • intro to Scala(Basic) • Quick Demo: Akka actors
- 3. ~ Why Scala ~ SCALA JAVA
- 4. ~ Why Scala ~ SCALA JAVA 8
- 5. ~ Why Scala ~ • Both JVM based • You can call Scala from Java and vice versa • Both are OOP but scala also supports functional Programming Major similarities with Java:
- 6. ~ Why Scala ~ • Scala reduces number of lines by using type inference • Learning curve is steep (syntax looks confusing) • Lazy evaluation: allows to defer time consuming computation, until absolutely needed Major differences with Java:
- 7. ~ Why Scala ~ • Functional as well as Object-Oriented • Scala is compatible with Java • Scala is compiled to Java byte-codes • Therefore, Scala runs on JVM
- 8. ~ A First Example ~
- 9. ~ Class Hierarchy ~
- 10. ~ Interaction with Java ~
- 11. ~ Everything is an Object ~ Numbers are object: means numbers has methods Functions are also object: you can pass them everywhere as object!
- 12. ~ Everything is an Object ~
- 13. ~ Everything is an Object ~
- 14. ~ Classes ~
- 15. ~ Case Class ~
- 16. ~ Case Class ~
- 17. ~ Pattern Matching ~
- 18. ~ Pattern Matching ~
- 19. ~ Traits ~
- 20. ~ Genericity ~
- 21. ~ 10 min Break ~
- 22. ~ Akka ~ • Name comes from Goddess (native swedes) that represents all wisdom and Beauty in the world. • Also name of beautiful mountain in Laponia, Sweden
- 23. ~ Akka ~ “Toolkit and runtime for building highly concurrent distributed message-driven applications on the JVM.”~akka.io
- 24. ~ Akka actor ~
- 25. ~ Akka actor ~
- 26. ~ Akka actor ~ Let’s do a demo!
- 27. : @5oheyl Keep in touch: Contact: [email protected]