Scala: Use Java Constructor with Subclasses in Scala

Question

I want to use a constructor, that is written in Java, in Scala.

The constructor is declared in that way:

public <SUBCLASS extends Node> NodeDock(Parent<? super Node> parent, Class<SUBCLASS> cls, LookupCriteria<SUBCLASS>[] criteria) {
   this(parent, cls, 0, criteria);
}

So if i want to use it:

val task = new NodeDock(scene.asParent(), classOf[FXTaskStackElement].asInstanceOf[Class[_]], new LookupCriteria[FXTaskStackElement]() {...}

Scala is giving me always an error that he cannot find the appropriate constrcutor with these parameters. So how can i get the SUBCLASS of FXTaskStackElement for the LookupCriteria?

Edit: In Java i would call this constrcutor like that, which works fine:

task = new NodeDock(scene.asParent(), FXTaskStackElement.class, new LookupCriteria<FXTaskStackElement>() {...})

Alexey Romanov · Accepted Answer · 2013-08-22 12:05:32Z

1

Why are you using classOf[FXTaskStackElement].asInstanceOf[Class[_]] instead of just classOf[FXTaskStackElement]? Since your second argument is a Class[_], there is no suitable SUBCLASS.

answered Aug 22, 2013 at 12:05

Alexey Romanov

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1 Comment

AKR Over a year ago

Oh my god, i have searched for the wrong problem... thank you, that was the point, i had to use .asInstanceOf for another constructor without it whould have not worked. So i thought that i have to use it with this constructor as well, but it works now with: val task = new NodeDock(scene.asParent(), classOf[FXTaskStackElement], new LookupCriteria[FXTaskStackElement]() {...}

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