Seq
http://www.scala-lang.org/api/current/scala/collection/Seq.html
Sequences always have a defined order of elements. Sequences provide a method apply for indexing.
Seq
is similar to java.util.List
.
Set
http://www.scala-lang.org/api/current/scala/collection/Set.html
A set is a collection that contains no duplicate elements.
This closely resembles a "set" in the mathematical sense: http://en.wikipedia.org/wiki/Set_(mathematics)
Set
is similar to java.util.Set
.