How to convert from from java.util.Map to a Scala Map

Question

A Java API returns a java.util.Map;. I would like to put that into a Map[String,Boolean]

So imagine w

Answer 1

useJavaMap.scala

import test._
import java.lang.Boolean
import java.util.{Map => JavaMap}
import collection.jcl.MapWrapper

object useJavaMap {
  def main(args: Array[String]) {
    var scalaMap : Map[String, Boolean] = Map.empty
    scalaMap = toMap(test.testing())
    println(scalaMap)
  }

  def toMap[K, E](m: JavaMap[K, E]): Map[K, E] = {
    Map.empty ++ new MapWrapper[K, E]() {
      def underlying = m
    }
  }
}

test/test.java

package test;

import java.util.*;

public class test {
    public static Map testing() {
        Map x = new HashMap();
        x.put("Test",Boolean.FALSE);
        return x;
    }
    private test() {}
}

Commandline

javac test\test.java
scalac useJavaMap.scala
scala useJavaMap
> Map(Test -> false)