Demo code for http://stackoverflow.com/questions/6879427/scala-write-string-to-file-in-one-statement

q5221524.scala

import java.io.{FileInputStream, IOException, InputStream}
import java.nio.charset.StandardCharsets
import java.nio.file.{Files, Paths}
import scala.io.Source

object q5221524 {

  def main(args: Array[String]): Unit = {

    // Setup
    Files.write(
      Paths.get("test.txt"),
      "test".getBytes(StandardCharsets.UTF_8))

    def isClosed(s: InputStream): Boolean =
      try {
        s.available()
        false
      } catch {
        case e: IOException
          if e.getMessage.contains("Stream Closed") =>
            true
      }

    // Tests:
    val is = new FileInputStream("test.txt")

    assert(!isClosed(is))

    println(Source.fromInputStream(is).mkString(""))

    assert(!isClosed(is))

    is.close()

    assert(isClosed(is))
  }
}