excerpted from : An Overview of the Scala Programming Language, Second Edition
http://www.scala-lang.org/docu/files/ScalaOverview.pdf
1. Scala
has object definitions (starting with object)
besides class
definitions. An object definition defines a class with a single
instance -- this is sometimes called a singleton object.
2. In
fact, every Java class is seen in Scala as two entities, a class
containing all dynamic members and a singleton object, containing all
static members. Hence, System.out is accessible in Scala as a member
of the object System.
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