public static void main(String[] args) {
    Map<String, String> map = new HashMap<String,String>(){{put("1","2");}};
scala.collection.mutable.Map<String, String> mapTest = JavaConverters.mapAsScalaMapConverter(map).asScala();
Object objTest = Map$.MODULE$.<String,String>newBuilder().$plus$plus$eq(mapTest.toSeq());
 
Object resultTest = ((scala.collection.mutable.Builder) objTest).result();
scala.collection.immutable.Map<String,String> resultTest2 = (scala.collection.immutable.Map)resultTest;
System.out.println(resultTest2.keySet());
}


感謝 scala中國 群裡的:
 _森_