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import scala.Option

class User(private val firstname: String, private val lastname: String)

object User {

  def unapply(user: User) = Option((user.firstname, user.lastname))

  def main(args: Array[String]): Unit = {
    val user = new User("剛次", "赤石")

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public class ArrayList<E> {...}

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import akka.actor.ActorSystem
import akka.actor.Props
import akka.actor.Actor
import akka.routing.RoundRobinRouter

object ActorSample {

def main(args: Array[String]): Unit = {
val system = ActorSystem("helloSystem")
val router = system.actorOf(Props[HelloActor].withRouter(RoundRobinRouter(4)))

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scala> val add = {(x:Int, y:Int, z:Int) => x + y + z}
add: (Int, Int, Int) => Int = <function3>

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import scala.util.Random

object PatternMatchConst {

  def main(args: Array[String]): Unit = {
    val random = Random.nextBoolean

    val num = random match {
      case true => 1
      case false => 0

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scala> 1 + 2
res0: Int = 3

scala> 3 - 1
res1: Int = 2

scala> 4 * 2
res2: Int = 8

scala> 6 / 3

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#/bin/sh

# commands.
SENDMAIL=/usr/lib/sendmail
ECHO=/bin/echo
GZIP=/bin/gzip
CAT=/bin/cat
RM=/bin/rm

# attachment file info.

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object CaseClass {

  def main(args: Array[String]): Unit = {
    val domain1 = new Domain3(1, "富樫")
    val domain2 = new Domain3(1, "富樫")

    println("==:", domain1 == domain2)
    println("!=:", domain1 != domain2)

    val domain3 = new Domain3(2, "虎丸")

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import java.io.File

object IfTest1 {

  def main(args: Array[String]): Unit = {
    var filename = "config.txt"

    if (!args.isEmpty)
      filename = args(0)

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object Option1 {

  def main(args: Array[String]): Unit = {
    val map = Map(1 -> "Moses", 2 -> "Lucas", 3 -> "Henderson")

    def check(o: Option[String]) {
      o match {
        case Some(s) => println(s)
        case None => println("Not exist.")
      }