I'm new to Scala and have imported an external Java (nmap4J) library that returns an object called:
class org.nmap4j.data.nmaprun.Verbose
I'm assuming I would ned to use the Scala Java Conversions, but I'm a little confused as where to start.
http://www.scala-lang.org/api/2.10.2/index.html#scala.collection.JavaConversions
You can use it just like you'd use it in Java, and it's type doesn't change: it's org.nmap4j.data.nmaprun.Verbose.
Conversions and Converters are intended to transform a Java standard library collection into a Scala standard library collection and vice versa. Generally speaking, if you have a Java collection that is not from the standard library, there's likely some reason for it to be different, and converting it to Scala would defy its purpose.
Lets say you have an unknown Object (scala Any / AnyRef) and you think it is a class of Verbose:
import org.nmap4j.data.nmaprun.Verbose
def checkObj(in: Any) {
in match {
case v: Verbose =>
// do something with v
case _ =>
// do error handling
}
This is the scala way of doing isInstanceOf / asInstanceOf. Almost always you can treat a java class like a scala class.
If your framework gives you java collections, you import, as you said correctly, java conversions.
import scala.collection.JavaConversions._
def doSomething(list: java.util.List[Any]) {
// map is now possible due to the implicit conversion of list
list.map(el => doStuff(el))
// other methods
list.toSeq
list.foreach(println)
}
