Scala学习笔记（四）：从文件里读取文本行

import scala.io.Source
if(args.length>0){
  for(line<-Source.fromFile(args(0)).getLines)
    print(line.length+" "+line)
}else{
  Console.err.println("Please enter FileName")
}

import scala.io.Source
def widthOfLength(s:String)=s.length.toString.length
if(args.length>0){
  val lines=Source.fromFile(args(0)).getLines.toList
  val longestLine=lines.reduceLeft(
    (a,b)=>if(a.length>b.length) a else b
  )
  val maxWidth=widthOfLength(longestLine)
  for(line<-lines){
    val numSpaces=maxWidth-widthOfLength(line)
    val padding=" "*numSpaces
    print(padding+line.length+"|"+line)
  }
}else{
  Console.err.println("Please enter FileName")
}