while loop alternatives in Scala

Loops.scala

import java.io._

object Loop1 extends App {
 //Java way 
  val inputStream: BufferedInputStream = new BufferedInputStream(new FileInputStream("input.csv"))
  val outputStream = new BufferedOutputStream(new FileOutputStream("output.csv"))
  val buffer = new Array[Byte](32 * 1024)
  var bytesRead: Int = inputStream.read(buffer)
  while (bytesRead > 0) {
    println("writing.......")
    outputStream.write(buffer, 0, bytesRead)
    outputStream.flush()
    bytesRead = inputStream.read(buffer)
  }
  inputStream.close()
  outputStream.close()

}


object Loop2 extends App {
  //Functional way
  val inputStream: BufferedInputStream = new BufferedInputStream(new FileInputStream("input.csv"))
  val outputStream = new BufferedOutputStream(new FileOutputStream("output.csv"))
  val buffer = new Array[Byte](32 * 1024)
  Stream.continually(inputStream.read(buffer)).takeWhile(_ > 0).foreach { bytesRead =>
    println("writing.......")
    outputStream.write(buffer, 0, bytesRead)
    outputStream.flush()
  }
  inputStream.close()
  outputStream.close()

}


object Loop3 extends App {
  //Functional way but better than 2
  val inputStream: BufferedInputStream = new BufferedInputStream(new FileInputStream("input.csv"))
  val outputStream = new BufferedOutputStream(new FileOutputStream("output.csv"))
  val buffer = new Array[Byte](32 * 1024)
  Iterator.continually(inputStream.read(buffer)).takeWhile(_ > 0).foreach { bytesRead =>
    println("writing.......")
    outputStream.write(buffer, 0, bytesRead)
    outputStream.flush()
  }
  inputStream.close()
  outputStream.close()

}