Cast a class in scala

The following example shows a way to cast a value in Scala. In this example, one of the java utility methods called “getNetworkInterfaces” class returns something we want cast to a more specific class, a NetworkInterface:

val e = NetworkInterface.getNetworkInterfaces
while(e.hasMoreElements) {
  val networkInterface = e.nextElement match {
    case e: NetworkInterface => e
    case _ => ???
  }

  // process this network adapter
}   

Once the “match” evaluates, the “networkInterface” variable will have the desired type.

If the cast fails, we throw NotImplementedException (??? is a shortcut for this). You could alternately try different casts by matching on other patterns.