Scala：Class Type参数扩展了抽象子类

Question

I'm new to Scala, coming from a beginner Java background, so please bear with me.

I have a class, Arbitrage, with an abstract subclass Builder. I would like Arbitrage's type parameter to extend the abstract subclass.

Ex:

   abstract class Arbitrage[T <: Builder[T]] {
    // lots of code
    abstract class Builder[T]{
        // build pattern code
    }
}

However this does not compile, and IntelliJ informs me that it "Cannot Resolve symbol "Builder". If I change the class signature to

class Arbitrage[T <: Ordered[T]] 

then it compiles, so I'm fairly sure it's an issue with visibility.

Regards

Answer 1

I solved my problem:

I was using Java syntax for accessing subclasses, eg, Arbitrage.Builder, what I needed was Arbitrage#Builder, this is the Scala syntax.