Java and Scala have essentially the same bytecode output as both compilers were written by Martin Odersky.
There are many links below: free books, PDFs, articles, videos, tutorials.
Or just Google "The busy Java developer's guide to Scala" (article), "Scala for the impatient" (PDF), "A Tour of Scala", "An Introduction to Scala for Java Developers" (about REPL) etc.
Java and Scala have essentially the same bytecode output as both compilers were written by Martin Odersky.
There are many links below: free books, PDFs, articles, videos, tutorials.
Or just Google "The busy Java developer's guide to Scala" (article), "Scala for the impatient" (PDF), "A Tour of Scala", "An Introduction to Scala for Java Developers" (about REPL) etc.