scala：输入输出（I/O）

d:/test.txt文件内容：

1
2
1 2

程序：

import scala.io.Source
def main(args: Array[String]): Unit = {
    val filename = "d:/test.txt"
    var bufferedSource = Source.fromFile(filename)
    //一行一个字符串，去掉行尾的换行符
    bufferedSource.getLines.zipWithIndex.foreach{
        case (line, idx) =>
            println(idx + ":" + line)
    }
    bufferedSource.close
    
    bufferedSource = Source.fromFile(filename)
    //将文件返回一个完整字符串
    println(bufferedSource.mkString)   
    bufferedSource.close
    
    bufferedSource = Source.fromFile(filename)
    println(bufferedSource.getLines.mkString("(", "|", ")")) //(1|2|1 2)
    bufferedSource.close
    
    bufferedSource = Source.fromFile(filename)
    println(bufferedSource.getLines.toList) //List(1, 2, 1 2)
    bufferedSource.close
}

输出：

0:1
1:2
2:1 2
1
2
1 2
(1|2|1 2)
List(1, 2, 1 2)