java的map和scala的map互相转换

 private static scala.collection.immutable.Map JavaMapToScala() {
        Map javamap = new HashMap<>();
        scala.collection.mutable.Map scalaMap = JavaConversions.mapAsScalaMap(javamap);
        Object obj = Map$.MODULE$.newBuilder().$plus$plus$eq(scalaMap.toSeq());
        Object result = ((scala.collection.mutable.Builder) obj).result();
        scala.collection.immutable.Map scala_imMap = (scala.collection.immutable.Map)result;
        return scala_imMap;
    }