Question

I’m attempting to learn Scala coming from a Java background. Should the below program run ? When I right click on the file Functional an option to run the file is not displayed. What do I need to change to run the method Timer.run?
I’m using the Eclipse3.7 & Scala plugin 2.0.2.

class Functional {

  object Timer {
    def oncePerSecond(callback: () => Unit) {
      while (true) { callback(); Thread sleep 1000 }
    }
    def timeFlies() {
      println("time flies like an arrow...")
    }
    def run() {
      oncePerSecond(timeFlies)
    }
  }

  def main(args: Array[String]) {
    Timer.run();
  }
}

Answer 1

The main method should reside on an object definition, not in class. The methods that are defined in an object are somewhat equivalent to static ones from Java.