Converting Map[String, Double] to java.util.Map[String, java.lang.Double]

Question

I thought we can rely on implicit conversion which converts scala.Double to java.lang.Double. So I tried the following:

import scal         


        

Answer 1

It seems that for String, you don't need to do any conversion, but is not the case for Double. You can use the method double2Double which is defined in Predef to convert to java.double.

import scala.collection.JavaConverters._

m.map { case (k, v) => k -> double2Double(v) }.asJava

or another way is to do asInstanceOf to convert it to Java map directly.