BufferedReader readLine返回值在scala中不被理解为字符串？

br.readLine返回一个String,map对String 的操作起作用Char

for { line <- br.readLine }

和...一样

br.readLine.map { line =>

你可以这样写:

val br = new BufferedReader(new FileReader("/tmp/test.txt"))
val outfile = new FileOutputStream("/tmp/x.txt")

var line:String = ""

while ({ line = br.readLine() ; line != null } ) {

   outfile.write(line.getBytes)
   outfile.write('\n')
}