scala - 为什么我不能访问我的对象成员变量？

Question

我有以下类(class)设置:

class MyClass {
  class MyInnerClass(memberVar: String)

  def getAInner: MyInnerClass = {
    new MyInnerClass("hello")
  }
}

然后我在课外有以下代码:

def myFunction = {
  val a = new MyClass
  val b = a.getAInner.memberVar // value memberVar is not a member of a.MyInnerClass
}

这是为什么？

Answer 1

您需要添加关键字val 以使memberVar 公开，否则它是私有(private)值:

  class MyClass {
    class MyInnerClass(val memberVar: String)

    def getAInner: MyInnerClass = {
      new MyInnerClass("hello")
    }
  }