j5ik2o

class Employee(val name:String)

object EmployeeTable {
  def insert(employee:Employee):Unit = { /* DBに保存 */ }
  def selectAll:List[Employee] = { /* DBから検索 */ }
}

// EmployeeTableがインスタンスそのもので、クラスは見えないところにある。
EmployeeTable.insert(new Employee("Junichi Kato"))
val employees = EmployeeTable.selectAll

j5ik2o

package money
import java.util.Currency
import java.util.Locale

class Money(private val amount:BigDecimal, val currency: Currency){
  def this(amount:BigDecimal) = this(amount, DEFAULT) // オブジェクトの定数が参照できる
  def plus(other:Money) = { /*略*/ }
}

// クラスと同名のオブジェクトを定義できます。

j5ik2o

https://gist.github.com/1297952

j5ik2o

package test;

import java.util.concurrent.CountDownLatch;

public class ReOrderingTest {
	static int x = 0;
	static int y = 0;
	static int a = 0;
	static int b = 0;

j5ik2o

package test;

import java.util.concurrent.TimeUnit;

public class StopThreadTest {
	private static boolean stopRequested;


	public static void main(String[] args)  {
		Thread t = new Thread(new Runnable() {

j5ik2o

package actor
import java.util.concurrent.CountDownLatch
import scala.collection.mutable.HashSet
import akka.stm._

class Sequence {
  var value = 0
  def getValue() = value
  def getAndIncrement() = synchronized {
    value += 1

j5ik2o

import scala.collection.immutable.NumericRange

object Util {
  // nまでの階乗を計算するメソッド
  def fac(n: BigInt) = 
    NumericRange(BigInt(1), n, BigInt(1)).
      foldLeft(BigInt(1)){(cur, next) =>
        cur * next
      }
}

j5ik2o

List(1,2,3,1).zip(List(1,1,1,1)).foldLeft(Map[Int,Int]()) { (x, y) => x.get(y._1) match { case Some(v) => x + Pair(y._1, (v + y._2)) case None =>  x + y }}

j5ik2o

object BenchUtil {

  private def avg(xs:List[BigDecimal]):BigDecimal =
    xs.sum / xs.size

  private def std(avg:BigDecimal, xs:List[BigDecimal]):BigDecimal =
    Math.sqrt((xs.foldLeft(BigDecimal(0))((s,c) => s + (c-avg) * (c+avg)) / xs.size).toDouble)

  private def center(xs:List[BigDecimal]) = xs.toSet.toList.sortWith(_ < _) match {
    case n :: Nil => n

j5ik2o

#!/usr/bin/env xsbtscript
!#

/***
scalaVersion := "2.9.1"

resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"

libraryDependencies ++= Seq(
  "se.scalablesolutions.akka" % "akka-stm" % "1.2"