Scala: how to inherit a “static slot”?

Question

Well, I\'m learning Scala so this question may be too basic for most people.

In Java I can have a static slot (function or variable) in a class, and then I will have

Answer 1

I don't know if this is what you meant, but a companion object can extend from some traits/classes:

class Person
class Student extends Person

trait Aggregation[T] {
  val all: List[T]
}

object Person extends Aggregation[Person] {
  val all: List[Person] = List(new Person, new Person)
}

object Student extends Aggregation[Student] {
  val all: List[Student] = List(new Student, new Student)
}

println(Person.all) // prints all persons
println(Student.all) // prints all students