Scala文件读取添加空格

Hello,World!
This,is,a,test.

import java.io.{BufferedReader, FileReader}

object ScalaFileReading {
  def main(args: Array[String]): Unit = {
    val file = "input.txt"
    val bufferedReader = new BufferedReader(new FileReader(file))
    var line: String = null
    while ({line = bufferedReader.readLine(); line != null}) {
      val words = line.split(",")
      val wordsWithSpaces = words.mkString(" ")
      println(wordsWithSpaces)
    }
    bufferedReader.close()
  }
}

Hello, World!
This, is, a, test.