Using Scala from Java: passing functions as parameters

Question

Consider the following Scala code:

package scala_java
object MyScala {
  def setFunc(func: Int => String) {
    func(10)
  }
}

Now in Ja

Answer 1

You have to manually instantiate a Function1 in Java. Something like:

final Function1 f = new Function1() {
    public int $tag() {
        return Function1$class.$tag(this);
    }

    public  Function1 compose(Function1 f) {
        return Function1$class.compose(this, f);
    }

    public String apply(Integer someInt) {
        return myFunc(someInt);
    }
};
MyScala.setFunc(f);

This is taken from Daniel Spiewak’s “Interop Between Java and Scala” article.