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: joinus@developers.nl