scala immutable.Map 和 mutable.Map 相互轉化

immutable.Map to mutable.Map

val m = collection.immutable.Map(1->"one",2->"Two")
val n = collection.mutable.Map(m.toSeq: _*)

mutable.Map to immutable.Map

val m = collection.mutable.Map(1->"one",2->"Two")
val n = m.toMap