Type in expressions to have them evaluated.
Type :help for more information.

scala> val v: java.util.ArrayList[String] = new java.util.ArrayList[String](5)
v: java.util.ArrayList[String] = []

scala>   val v: java.util.ArrayList[String] = new java.util.ArrayList[String](5)
v: java.util.ArrayList[String] = []

scala> :quit