Using scala object inside java?

Question

In my java code, I am calling a method, from a class which is defined in Scala, and I want to use one of its methods in java. Here is how I call it and it works fine.

Seq<SomeObjectType> variableName = ScalaClass.MethodInTheScalaClass();

I can call this function in java in this form, but since I am calling this method from a compiled package, I can't see what it going on (and therefore I can't change it).

The problem now is that, I don't know how to iterate over the "variableName" in java (since Seq is a scala type).

How can I iterate over variableName or convert it to a Java object (e.g. List)?

senia · Accepted Answer · 2014-10-21 06:50:54Z

3

Try this:

java.util.List<SomeObjectType> res = 
  scala.collection.JavaConverters$.MODULE$.seqAsJavaListConverter(variableName).asJava();

You could get converters list in JavaConverters documentation.

You should use JavaConverters$.MODULE$ to get JavaConverters object from Java.

edited Oct 21, 2014 at 6:50

answered Oct 21, 2014 at 6:45

senia

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2 Comments

Daniel Over a year ago

Thank you! So, if I have only java (no scala) everything should work perfectly fine; right?

senia Over a year ago

@Daniel: you'll need scala lib, but you'll need it anyway to use ScalaClass. In case you have plenty of such scala methods to use in java code I'd recommend you to create java-friendly ScalaClassJavaApi wrapper using scala - you could use scala in any maven java project using scala-maven-plugin.

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