如何使用scala中的java.util.Scanner

Question

我尝试使用scala中的 java.util.Scanner ：

val scanner = new java.util.Scanner(System.in)
val line = scanner.readLine()
println(line)

通过粘贴scala REPL或运行scala file.scala，我得到了这个：

:2: error: value readLine is not a member of java.util.Scanner
val line = scanner.readLine()

我错过了什么？

Answer 1

java.util.Scanner没有readLine尝试nextLine。

scala> val scanner = new java.util.Scanner(System.in)
scanner: java.util.Scanner = java.util.Scanner[delimiters=\p{javaWhitespace}+][position=0][match valid=false][need input=false][source closed=false][skipped=false][group separator=\,][decimal separator=\.][positive prefix=][negative prefix=\Q-\E][positive suffix=][negative suffix=][NaN string=\Q�\E][infinity string=\Q∞\E]

scala> val line = scanner.nextLine()
line: String = foo

Answer 2

最简单的方法似乎是使用JavaConverters将Scanner用作Iterator：

import scala.collection.JavaConverters._
...
val input = new Scanner(System.in).asScala
input.head // first element
val asList = input.toList // scala list