在Java中是否可以调用另一个类的main方法并返回到调用代码？ [英] Is it possible in Java to Invoke another class' main method and return to the invoking code?

问题描述

public class A{
    public static void main(String[] args)
    {
        //Main code
    }
}

public class B{
    void someMethod()
    {
        String[] args={};
        A.main();
        System.out.println("Back to someMethod()");
    }
}

有什么办法吗？去做这个？我找到了一种使用反射做同样的方法，但也没有返回到调用代码。我尝试使用 ProcessBuilder 在一个单独的进程中执行它，但我想我错过了一些东西。

Is there any way to do this? I found a method of doing the same using reflection but that doesn't return to the invoking code either. I tried using ProcessBuilder to execute it in a separate process but I guess I was missing out something.

推荐答案

你的代码已经差不多了 - 它只是没有传入参数：

Your code already nearly does it - it's just not passing in the arguments:

String[] args = {};
A.main(args);

main 方法只是特殊就它被视为切入点而言。它是一种非常普通的方法，可以从其他代码中调用而没有任何问题。当然，如果它以期望的方式编写，它可能会遇到问题，它只被称为入口点（例如，如果它使用 System.exit ）但从语言的角度来看，这很好。

The main method is only "special" in terms of it being treated as an entry point. It's otherwise a perfectly normal method which can be called from other code with no problems. Of course you may run into problems if it's written in a way which expects it only to be called as an entry point (e.g. if it uses System.exit) but from a language perspective it's fine.

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