bug711.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 15 行

abstract class Component

class Button extends Component {
  def sayHey: Unit = Console.println("Hey, I'm a button") }
  
abstract class Origin {
  val delegate: Component }

object main extends Origin with Application {
  val delegate: Component {
    def sayHey: Unit
  } = new Button
  delegate.sayHey
}