title: example of using scala.collection.immutable.Set from java
body: <p>Does anyone out there who's familiar with Scala know how I could use <a href="http://www.scala-lang.org/docu/files/api/scala/collection/immutable/Set.html" rel="noreferrer">scala.collection.immutable.Set</a> from Java? I can vaguely read the scaladoc, but am not sure how to call scala methods like "-" from java (I assume that I just need to include some scala .jar file in my classpath...?)</p>