Add to Scala List of type List[(Int) => Unit] from Java [duplicate]

Question

I am working on a project which contains both Scala and Java code. I have a Scala method defined as :

var responseListeners: List[(Int) => Unit]

  def addResponseListener(onResponse: Int => Unit) {
    responseListeners ::= onResponse
  }

And this method is called in Scala as:

addResponseListener(id => processors(id).wakeup())

Now I have some Java code in which I have access to the processors array, but how do I call the addResponseListener(onResponse: Int => Unit) from Java?

Sean Vieira · Accepted Answer · 2017-09-05 23:27:38Z

2

Use AbstractFunction1 from scala.runtime:

AbstractFunction1<scala.lang.Int, Void> f = (i) -> doWorkWith(i);

In the event that doWorkWith does not return void you'll need to return null; from the lambda:

i -> {
  doWorkWith(i);
  return null;
}

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