Scala List 转换成 Java List

版权声明：博客为作者平时学习备忘，参考资料已在文尾列出一并表示感谢。如若转载，请列明出处。 https://blog.csdn.net/woai8339/article/details/84976096

比如，用scala原生mongodb-scala-driver时，maven是：

<!--scala-mongodb-->
        <dependency>
            <groupId>org.mongodb.scala</groupId>
            <artifactId>mongo-scala-driver_2.11</artifactId>
            <version>1.0.1</version>
        </dependency>

如果mongodb需要认证，在credentialList按ctrl+鼠标左键看的时候是:

public MongoClientSettings.Builder credentialList(List<MongoCredential> credentialList) {
            this.credentialList = Collections.unmodifiableList((List)Assertions.notNull("credentialList", credentialList));
            return this;
        }

为JavaList。因此，scalaList需要.asJava转换成JavaList。
先import scala.collection.JavaConverters._ 才有.asJava方法。
会有：

val settings: MongoClientSettings = MongoClientSettings.builder() .clusterSettings(clusterSettings).credentialList(credentialList.asJava) .sslSettings(SslSettings.builder().enabled(true).build()) .streamFactoryFactory(NettyStreamFactoryFactory()) .build()