stap2.scala

import scala.util.Random

object Main {

  val random = new scala.util.Random

  def main(args:Array[String]):Unit = {
    Iterator.continually(findSTAP).takeWhile(_ != "STAP").toList

    println("見つかったよ！")
  }

  def findSTAP():String = { 
    val str = randomAlphanumericString(4)
    print(str + "細胞")
    str
  }
   
  def randomString(alphabet: String)(n: Int): String = 
    Stream.continually(random.nextInt(alphabet.size)).map(alphabet).take(n).mkString

  def randomAlphanumericString(n: Int) = 
      randomString("ABCDEFGHIJKLMNOPQRSTUVWXYZ")(n)

}