def withPrintWriter(f: File, operation: PrintWriter => Unit) {
  val writer = new PrintWriter(f)
    try {
      operation(writer)
    } finally {
      writer.close()
    }
}

withPrintWriter(someFile, writer => {
  print("today is ")
  println(new java.util.Date)
})

withPrintWriter(someFile, writer => {
  writer.print("today is ")
  writer.println(new java.util.Date)
})