Scala 脚本中未调用 Main 方法 [英] Main method is not called in Scala script

问题描述

我是 Scala 的新手，我想知道为什么 main 方法没有在这个脚本中运行?

I am brand new to Scala, and I was wondering why the main method is not running in this script?

class Word {
}

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

有趣的是，当我删除 Word 类时它工作正常.为什么是这样?我该如何解决?

The interesting thing is that it works fine when i remove the Word class. Why is this? And how do I fix it?

推荐答案

如scala入门所示，当将 Scala 文件作为脚本运行时，您应该显式调用 main 方法:

As shown in getting started with scala, you should explicitly invoke the main method, when running scala files as a script:

class Word {
}

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

HelloWorld.main(args)

如果你想编译和运行，你必须给出包含 main 方法的对象的名称:

If you want to compile and run, you'll have to give the name of the object holding the main method:

scalac test.scala
scala HelloWorld

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