Avaliando Scala 2

CommonsCollections.scala

object Colecoes extends Application {
  val lista = List.range(-5, 5)

  CollectionUtils.forAllDo(
    CollectionUtils.collect(
      CollectionUtils.select(lista,
        new Predicate() {
          def evaluate(obj: Object): Boolean =
            return obj.asInstanceOf[Int] > 0;
        }), new Transformer() {
        def transform(obj: Object): Object = {
          return (2 * obj.asInstanceOf[Int])
            .asInstanceOf[Object];
        }
      }),
    new Closure() {
      def execute(obj: Object) {
        println(obj);
      }
    })
}

MostraParametrosServlet.scala

@WebServlet(Array("/mostraParams"))
class MostraParametrosServlet extends HttpServlet {
  override def doGet(req: HttpServletRequest,
    resp: HttpServletResponse) {
    val out = resp.getWriter();
    req.getParameterMap()
      .map {case (chave, valor) => chave +" = "+ valor.mkString(",")}
      .foreach(out.println(_))
  }
}

ParCol.scala

object ColecoesParalelas{
  def main(args: Array[String]) {
    (1 to 5).foreach(println);
    (1 to 5).par.foreach(println); 
  }
}

PiAtores.scala

object PiAtores {
  def main(args: Array[String]) {
    new Coordenador(2).start
  }
}

ScalaCollections.scala

lista.filter(_ > 0).map(_ * 2).foreach(println(_));