0017.包、类、对象、成员的访问权限

package com.jn.scala

/**
* 包、类、对象
* Created by admin on 2015/11/13.
*/

package spark{
  package navigation{
  private [spark] class Navigator{ //Navigator的可见度扩展到包spark,包spark的所有类、对象和包可见Navigator
    protected [navigation] def useStarChat(){} //当前类可以用，子类可以用，包navigation可用
    class LegOfJoutney{
      private [Navigator] val distance = 100
    }
    private [ this ] var speed = 200 //只能有当前对象可用，非常严格
  }
  package launch{
    import navigation._
    object Vehicle{
      private [launch] val guide = new Navigator
    }
  }
  }

}
class PackageOps_Advanced{
  import PackageOps_Advanced.power //引入对象的属性
  private def canMakeItTrue = power > 10001 //使用对象的属性
}
object PackageOps_Advanced {
  private def power = 10000
  def makItTrue(p: PackageOps_Advanced): Boolean={
    val result = p.canMakeItTrue //调用类的方法
    result
  }

}