Scala Language Java Interoperability Converting Scala Collections to Java Collections and vice versa
Example
When you need to pass a collection into a Java method:
import scala.collection.JavaConverters._ val scalaList = List(1, 2, 3) JavaLibrary.process(scalaList.asJava)
If the Java code returns a Java collection, you can turn it into a Scala collection in a similar manner:
import scala.collection.JavaConverters._ val javaCollection = JavaLibrary.getList val scalaCollection = javaCollection.asScala
Note that these are decorators, so they merely wrap the underlying collections in a Scala or Java collection interface. Therefore, the calls .asJava and .asScala do not copy the collections.
