Scala, Java, Unix, MacOS tutorials (page 310)

Update: I’ve made almost one-half of my Kindle eBook, How I Sold My Business: A Personal Diary, freely available online. There are no ads, and no registration required, it’s just free.

Scala FAQ: When compiling a Scala application with SBT, I get warning messages like these:

$ sbt compile

[warn] there were 6 deprecation warnings; re-run with -deprecation for details
[warn] there were 4 feature warnings; re-run with -feature for details

How do I ’re-run with -deprecation’ or ’re-run with -feature’?

Here’s a little snippet of code that shows how to create a Java JSlider, and then configure the JSlider. The code is written in Scala, which as you can see, is remarkably similar to Java:

As a quick note, import statements that used to be like this with Akka 2.0:

import akka.dispatch.Await
import akka.dispatch.Future
import akka.util.duration._

are now like this with Akka 2.1 and Scala 2.10.x:

import scala.concurrent.{Await, Future}
import scala.concurrent.duration._

The Duration object in Akka 2.0 has also been moved, and it’s now included with the scala.concurrent.duration._ import statement.

A few days ago I wrote that I didn’t like the tone of Rod Johnson’s Scala Days keynote address; I thought it was a downer, when it could have been much more uplifting and inspirational, while still getting across some very important points.