Scala 2.9 无法运行“hello world"Windows XP 上的示例

问题描述

我正在尝试在 Windows XP 上使用 Scala 2.9.1 final 运行 HelloWorld 示例:

I'm trying to run HelloWorld sample with scala 2.9.1 final on Windows XP:

object HelloWorld extends App {
  println("Hello, World!")
}

文件保存为Hello.scala.

当我运行 scalac Hello.scala 时，没问题.

When I run scalac Hello.scala, it's ok.

当我运行 scala Hello 时，它写道:

When I run scala Hello, it writes:

"Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target"

这太荒谬了，我的 echo %PATH% 包含:

It's ridiculous, my echo %PATH% contains:

C:\Program Files\Java\jdk1.6.0_25\bin;
C:\Program Files\Java\jdk1.6.0_25\jre\lib;
C:\Program Files\Java\jdk1.6.0_25\lib;
C:\Program Files\scala\bin

所以一切似乎都在类路径中.

so everything seems to be in classpath.

运行 scala -classpath "%PATH%;."你好也无济于事.

请帮忙.

推荐答案

不应该是scala HelloWorld吗?

我也可以在 Mac 上重现您的问题:

I can repro your problem on Mac too:

$ scalac hello.scala
$ scala HelloWorld
Hello, World!
$ scala Hello
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Hello
    at scala.sys.package$.error(package.scala:27)
    at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
    at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
    at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
    at scala.Option.getOrElse(Option.scala:109)
    at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
    at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
    at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

scala 需要类名或源名.scala Hello 不能解析为其中任何一个.

scala expects either a class name or a source name. scala Hello doesn't resolve to either of them.

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