1 package big.data.analyse.scala.classes 2  3 /** 4   * Created by zhen on 2018/9/11. 5   * 伴生对象 6   */ 7 //定义私有的构造方法 8 class Marker private(val color : String){ 9   override def toString() : String = "marker color " + color10 }11 object Marker{12   private val markers = Map(13     "red" -> new Marker("red"),14     "blue" -> new Marker("blue"),15     "green" -> new Marker("green")16   )17   def apply(color : String) = if(markers.contains(color)) markers(color) else null18 }19 object Main{20   def main (args: Array[String]) {21     //Error:(33, 18) constructor Marker in class Marker cannot be accessed in object Main22     //val marker = new Marker("haha")23     println(Marker("blue"))24     println(Marker("green"))25     println(Marker("red"))26     println(Marker("white"))27   }28 }