一，java Map 转为 scala.collection.immutable.Map

public static <K, V> scala.collection.immutable.Map<K, V> toScalaImmutableMap(java.util.Map<K, V> jmap) {
        List<Tuple2<K, V>> tuples = jmap.entrySet()
                .stream()
                .map(e -> Tuple2.apply(e.getKey(), e.getValue()))
                .collect(Collectors.toList());

        Seq<Tuple2<K, V>> scalaSeq = scala.collection.JavaConverters.asScalaBufferConverter(tuples).asScala().toSeq();

        return (scala.collection.immutable.Map<K, V>) scala.collection.immutable.Map$.MODULE$.apply(scalaSeq);
    }

二，scala使用String.join

hudiPath = String.join(",", scala.collection.JavaConverters.asJavaCollection(hudiPaths))

三，java list 转 scala list

import scala.collection.JavaConverters.asScalaBufferConverter
  javaList.asScala.toList