Path dependent types - inner class in java is related to enclosing class, inner class in Scala is related to object it is created from

App.java

package animal;

class Animal {

    class Sound{
        final String sound;

        public Sound(String sound){
            this.sound = sound;
        }
    }
}


public class App {
    public static void main(String[] args){
        var dog = new Animal();
        var cat = new Animal();

        var dogSound =  dog.new Sound("voff");
        var catSound = cat.new Sound("mjau");

        dogSound = catSound;

        System.out.println(dogSound.sound);
    }
}

Test.scala

class Animal {

  class Sound(sound: String) {

  }

}


object Test {


  def main(args: Array[String]): Unit = {
    val dog = new Animal
    val cat = new Animal
    var dogSound = new dog.Sound("voff")
    val catSound = new cat.Sound("mjau")

    // Error:(21, 16) type mismatch;
    // found   : cat.Sound
    // required: dog.Sound
    // dogSound = catSound


  }
}