如何從文件

Question

讀取字符串列表[INT]我有一個具有幾行這樣一個文本文件：

SK1, 2, 3, 4, 5 
SK2, 1, 3, 5, 1 

我想讀它，並將其存儲在一個Map [字符串，列表[ Int]]但是我寫的代碼是以Map [String，List [Any]]的形式出現的，我不知道如何解決它。你可以幫我嗎？

def readFile(filename: String): Map[String, List[Any]] = { 

var mapBuffer: Map[String, List[Any]] = Map() 
try { 
    for (line <- Source.fromFile(filename).getLines()) { 
    val splitline = line.split(",").map(_.trim).toList 

    mapBuffer = mapBuffer ++ Map(splitline.head -> splitline.tail) 

    } 
} catch { 
    case ex: Exception => println("There was an exception, please try again.") 
} 
mapBuffer 
} 

我也試過

def readFile(filename: String): Map[String, List[Int]] = { 

var mapBuffer: Map[String, List[Int]] = Map() 
try { 
    for (line <- Source.fromFile(filename).getLines()) { 
    val splitline = line.split(",").map(_.trim).toList.map(_.toInt) 

    mapBuffer = mapBuffer ++ Map(splitline.head -> splitline.tail) 

    } 
} catch { 
    case ex: Exception => println("There was an exception, please try again.") 
} 
mapBuffer 
} 

但給我地圖[任意，列表[INT]]。任何幫助將不勝感激，謝謝。

Answer 1

def readFile(filename: String): Map[String, List[Int]] = { 
    // map over lines in file 
    Source.fromFile(filename).getLines.map{ line => 
    // split the line into head and tail 
    val ::(head, tail) = line.split(",").map(_.trim).toList 
    // convert the tail to Int type 
    head -> tail.map(_.toInt) 
    } 
    .toMap // convert to Map 
}