In Scala, how do I initialize abstract vals in features?

Question

Suppose I have the following trait with two abstract vals

trait Base { val startDate: java.util.Date val endDate: java.util.Date } 

Now I have an abstract class extending the stroke

 abstract class MyAbstract extends Base ... 

Now I want to instantiate an abstract class with several other attributes mixed in.

  def main(args: Array[String]) { new MyAbstract with MixIn1 with MixIn2 } 

How to pass specific values ​​for startDate and endDate?

Answer 1

Since MyAbstract is an abstract class, you cannot directly create it. You need to either subclass it explicitly, or create an instance of an anonymous subclass, for example.

 def main(args: Array[String]) { val myInstance = new MyAbstract with MixIn1 with MixIn2 { val startDate = ... val endDate = ... } }