How to override a mutable variable in Trait in scala?

Question

I\'d like override one mutable variable in Trait in constructor. But it will complain that \"overriding variable a in trait A of type Int; variable a cannot override a mutab

Answer 1

try use val instead of var and use override. It work when A is abstract class, Like this:

abstract class A{
  val a:Int = 0
}

class B extends A{
override val a:Int=1
}