scala進階18-隱式轉換-隱式參數

/**
  * 隱式參數
  */
object Context_Implicits {
  implicit val default: String = "Java"
}

object Param {
  //編譯器會檢查誰是implicit的變量(全局範圍內查找隱式值),如果有,會默認傳遞過來
  def print(content: String) (implicit language: String): Unit = {
    println(language + " : " + content)
  }
}

object Implicit_Parameters {
  def main(args: Array[String]): Unit = {
    Param.print("Spark")("Scala")

    //引入隱式變量
    import Context_Implicits._
    Param.print("Hadoop")
  }
}