从继承的受保护 Java 字段创建公共访问器

我怎样才能完成以下工作：

class Foo extends javax.swing.undo.UndoManager {
  // increase visibility - works for method
  override def editToBeUndone: javax.swing.undo.UndoableEdit = super.editToBeUndone

  // fails for field
  def edits: java.util.Vector[javax.swing.undo.UndoableEdit] = super.edits
}

注意edits是一个受保护的领域CompoundEdit（超类UndoManager）。我想要一个具有相同名称的公共访问器来读取该字段。我该怎么做呢？

<console>:8: error: super may be not be used on variable edits
         def edits: java.util.Vector[javax.swing.undo.UndoableEdit] = super.edits
                                                                            ^

嗯，总有反思。

class Foo extends javax.swing.undo.UndoManager {
  def edits(): java.util.Vector[javax.swing.undo.UndoableEdit] =
    classOf[javax.swing.undo.CompoundEdit].
    getDeclaredField("edits").get(this).
    asInstanceOf[java.util.Vector[javax.swing.undo.UndoableEdit]]
}

您还可以通过嵌套来消除这两个调用的歧义，尽管这很丑陋：

class PreFoo extends javax.swing.undo.UndoManager {
  protected def editz = edits
}
class RealFoo extends PreFoo {
  def edits() = editz
}

你确实需要()，但是——如果它不与字段本身冲突（并且您不能覆盖val with a def).