I'm trying to convert Scala List to a Java ArrayList.
import collection.JavaConverters._
val list: java.util.ArrayList[String] = List("hello", "world").asJava
It doesn't seem to be working.
How can I do this?
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3 Answers
The asJava function returns an object that implements the java.util.List interface. This object is backed by your original list. You can find the documentation for this here (check the seqAsJavaList function):
http://www.scala-lang.org/api/2.12.0/scala/collection/JavaConverters$.html
If you want an instance of java.util.ArrayList, you can create one using the constructor that takes a Collection. Like this:
import java.util.ArrayList
val list = new ArrayList(List("hello", "world").asJava)
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asJava return a java.util.List, not an ArrayList You can convert to an ArrayList using the constructor ArrayList(c: java.util.Collection[_ <: String)
val list: java.util.ArrayList[String] = new java.util.ArrayList(List("hello", "world").asJava)
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Try this:
val list: java.util.ArrayList[String] = new java.util.ArrayList[String]()
list.addAll(List("hello", "world").asJava)
