だぶるころんで連結さす
$ scala Welcome to Scala version 2.10.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_51). Type in expressions to have them evaluated. Type :help for more information. scala> val list1 = Nil list1: scala.collection.immutable.Nil.type = List() scala> val List2 = "Scala"::list1 List2: List[String] = List(Scala) scala> val list3 = "Java"::List2 list3: List[String] = List(Java, Scala) scala>