如何从java程序的main方法调用Scala程序的main方法？ [英] How to call main method of a Scala program from the main method of a java program?

问题描述

假设我在Java项目中有一个Scala类和一个Java类，scala类如下所示

Suppose I have a Scala class and a Java class in a Java project and the scala class is like below

class Sam {

  def main(args: Array[String]): Unit = {
    println("Hello")
  }

}

如何从同一项目中存在的java程序的main方法调用它的main方法

How can I call it's main method from the main method of a java program which is present in the same project

推荐答案

通常，主要方法是Java中的 static ，以及<$ Scala中的c $ c> object 。这允许您从命令行运行它们。您的代码定义了类，而不是对象。

Typically, main methods are static in Java, and in an object in Scala. This allows you to run them from the command line. Your code defines a class, not an object.

我建议将您的Scala代码更改为：

I'd suggest changing your Scala code to:

object Sam {
  def main(args: Array[String]): Unit = {
    println("Hello")
  }
}

然后你可以从你的Java main方法中调用它，如下所示：

You can then call this from your Java main method as follows:

class Foo  {
    public static void main(String[] args) {
        Sam.main(args);
    }
}

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