How can I use a Scala singleton object in Java?

user786045 picture user786045 · Sep 5, 2012 · Viewed 17.3k times · Source

I have a Scala object that I need to use in a Java class.

Here's the Scala object

object Person {
  val MALE = "m"
  val FEMALE = "f"
}

How can I use this Scala object in Java?

I have tried the following so far without success (compile errors):

  • Person.MALE() //returns a String which is useless as I want the actual Person object

Answer

Petr picture Petr · Sep 5, 2012

Use Person$.MODULE$. See also


Edit: A working example (I checked, it compiles and works): Scala:

object Person {
  val MALE = "m";
}

Java counterpart:

public class Test {
    Person$ myvar = Person$.MODULE$;

    public static void main(String argv[]) {
        System.out.println(new Test().myvar.MALE());
    }
}