Overriding the common attribute method in Scala

Question

I have identified a common feature of the environment:

trait Environment[T]

Why do I provide this implementation:

class MyEnvironment extends Environment[Integer] {
 val specific: Integer = 0
}

In addition, I defined a common attribute of an event that has one method that takes a general environment parameter as a parameter:

trait Event[T] {
  def exec(e: Environment[T])
}

For this event property, I presented the following implementation, where the exec () method takes a parameter of type MyEnvironment so that I can access the specific value of MyEnvironment.

class MyEvent extends Event[Integer] {
  override def exec(e: MyEnvironment): Unit = {
    println(e.specific)
  }
}

However, Scala compilers throws an error, from where it seems that MyEnvironment is not recognized as an environment [Integer]:

Error: The exec method does not cancel anything.

Note: superclasses of the MyEvent class contain the following non-finite members named exec: def exec (t: main.vub.lidibm.test.Environment [Integer]): Unit

Is it possible to do this work or are there templates to work around this problem.

Answer 1

; .

def exec(e: Environment[T]): Unit

override def exec(e: MyEnvironment): Unit 

, . , , , def foo(a: Any) def foo(s: String).

, , ( , , T <: Environment[_], , , T, Environment, MyEnvironment ).

Answer 2

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