Java：如何从主程序/类中单独运行线程？ [英] Java: How to run thread separately from main program/class?

问题描述

SUBJ。如何从主类BUT分别从该类运行线程？

Subj. How to run thread from main class BUT separately from that class?

所以有一些细节：我有一个程序必须运行一个进程。该进程（一个cmd）仅在主程序完成并从内存中卸载时运行。并且只有在卸载主程序后才开始他的工作。

So a bit of details: I have one program which must run a process. That process (a cmd one) runs only when main program finished and unloaded from memory. And only after unload main program that process starting his work.

我应该在程序中添加什么？

What should I add to the program?

推荐答案

如果你意思是：如何启动一个不会在我的JVM（java程序）执行时结束的Java线程？。

答案是：你不能这样做。

因为在Java中，如果JVM退出，所有线程都完成了。这是一个例子：

Because in Java, if the JVM exits, all threads are done. This is an example:

class MyRunnable implements Runnable { 
   public void run() { 
       while ( true ) { 
           doThisVeryImportantThing(); 
       } 
   } 
} 

以上程序可以启动例如，来自你的主线程的代码：

The above program can be started from your main thread by, for example, this code:

MyRunnable myRunnable = new MyRunnable(); 
Thread myThread = new Thread(myRunnable);
myThread.start(); 

除非 doThisVeryImportantThing 将终止该线程。您可以将其作为守护程序运行，如下例所示：

This example program will never stop, unless something in doThisVeryImportantThing will terminate that thread. You could run it as a daemon, as in this example:

MyRunnable myRunnable = new MyRunnable(); 
Thread myThread = new Thread(myRunnable);
myThread.setDaemon(true); // important, otherwise JVM does not exit at end of main()
myThread.start(); 

这将确保，如果main（）线程结束，它也将终止myThread。

This will make sure, if the main() thread ends, it will also terminate myThread.

但是你可以从java启动一个不同的JVM，因为你可能想看看这个问题：
从Java应用程序启动JVM进程使用Runtime.exec？

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