Over a million developers have joined DZone.

Scala: Converting a scala collection to java.util.List

DZone's Guide to

Scala: Converting a scala collection to java.util.List

· Java Zone ·
Free Resource

Get the Edge with a Professional Java IDE. 30-day free trial.

I’ve been playing around a little with Goose – a library for extracting the main body of text from web pages – and I thought I’d try converting some of the code to be more scala-esque in style.

The API of the various classes/methods is designed so it’s interoperable with Java code but in order to use functions like map/filter we need the collection to be a Scala one.

That’s achieved by importing ‘scala.collections.JavaConversions._’ which will apply an implicit conversion to convert the Java collection into a Scala one.

I needed to go back to the Java one again which can be achieved with the following code:

import scala.collection.JavaConversions._
val javaCollection = seqAsJavaList(Seq("abc"))

I also used that function in the StopWords.scala object in Goose.

There are a load of other functions available in JavaConversions as well for going to a Dictionary, Map, Set and so on.


From http://www.markhneedham.com/blog/2012/02/05/scala-converting-a-scala-collection-to-java-util-list/

Get the Java IDE that understands code & makes developing enjoyable. Level up your code with IntelliJ IDEA. Download the free trial.


Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}