case class Pair[A, B](first: A, second: B) extends Product with Serializable
Java API Represents a pair (tuple) of two elements.
Additional tuple types for 3 to 22 values are defined in the akka.japi.tuple package, e.g. akka.japi.tuple.Tuple3.
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- JavaAPI.scala
          
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-  new Pair(first: A, second: B)
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-  def ensuring(cond: (Pair[A, B]) ⇒ Boolean, msg: ⇒ Any): Pair[A, B]
-  def ensuring(cond: (Pair[A, B]) ⇒ Boolean): Pair[A, B]
-  def ensuring(cond: Boolean, msg: ⇒ Any): Pair[A, B]
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-  val first: A
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-  val second: B
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-  def →[B](y: B): (Pair[A, B], B)