如何在Java中使用Scala单例对象？

Question

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 1

Use Person$.MODULE$ . See also

• How can I pass a Scala object reference around in Java?
• Singletons as Synthetic classes in Scala?

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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());
    }
}

Answer 2

In case you use a package object , the access is a bit different

Scala:

package my.scala.package

package object Person {
  val MALE = "m";
}

Java counterpart:

public static void main() {
  System.out.println(my.scala.package.Person.package$.MODULE$.MALE);
}