.sc和.scala文件有什么区别?

下面是我创建的示例文件:

我的斯卡拉

object My {

  /** Our main function where the action happens */
  def main(args: Array[String]) {


    Logger.getLogger("org").setLevel(Level.ERROR)
    val sc = new SparkContext("local[*]", "my")
    val lines = sc.textFile("readme.tx")
    val results = lines.countByValue()

   }
}

理科硕士

object My {

  val hello: String = "Hello World!"
  println(hello)
}