In python, we can solve it like:

And in java, we can use:

public Dataset<Row> join(Dataset<?> right,
                scala.collection.Seq<String> usingColumns,
                String joinType)

more in http://spark.apache.org/docs/2.1.0/api/java/index.html

According to question：

http://stackoverflow.com/questions/35988315/convert-java-list-to-scala-seq

the usingColumns parameter can be defined as ArrayList.