Scala How to use extends with an anonymous class

Question

Is there a way to extends another class from an Anonymous class in Scala? I means something like

abstract class Salutation {
  def saybye(): String = "Bye"
}

class anotherClass() {
  def dummyFunction() = {

    val hello = new {
      def sayhello(): String = "hello" 
    } extends Salutation

    val hi  = hello.sayhello //hi value is "Hello"
    val bye = hello.saybye   //bye value is "bye"
  }
}

Answer 1

Yep, and it looks pretty much the same as it does in Java:

abstract class Salutation {
  def saybye: String = "Bye"
}

val hello = new Salutation {
  def sayhello: String = "hello" 
}

val hi = hello.sayhello
val bye = hello.saybye

If Salutation is an abstract class or trait with a sayhello method with the same signature, you'll have provided an implementation; otherwise you'll have created an instance of an anonymous structural type:

hello: Salutation{def sayhello: String}

Note that calls to the sayhello method involve reflection (because of the way structural types are implemented in Scala), so if you're using this method heavily you should probably define a new trait or class.