Running bat file in Child Thread

Question

Hi
Please first of all i will tell you my application flow.
I have an application you can say Parent Process/application , In execution of this Process or thread my application start/run batch file before dying using "exec() funtion" .In batch i have some scripts.and after initiating batch command my application main process ends up.
Now problem is
I am not sure that child process or Batch script which main program called is alive when my main application closed or its running?
i want to see its output on console?
Is it possible that Parent Thread ends up and child is still running , how can i achieve this .
OR is it possible that i create seprate thread to start batch and my main thread ends. and i will show batch file output on console.

Answer 1

I'm having a hard time understanding what you're
saying, so here are a few general things that may be
relevant:Sorry for that , well you are very much near which i want.But Thanks
* Child threads can keep running after the thread
that spawned them dies. You don't need to do anything
special here.
* The VM will exit when there are no more non-daemon
threads running. So if you make all threads other
than your main thread daemons, then when main ends,
the rest of the threads will die and the VM will
exit. See Thread.setDaemon.Here in above two point i have confusion.that by VM you mean Parent process,
VM is parent process of all java programs that we run.please clarify this
Lets say VM is parent process than your first statement is no valid as in first you say that parent die it will not effect child threads.
well i have test this case with my program i write a program like
public class ThreadTest
     public static void main(String [] arg)
          Work work=new Work(1000);
          System.out.println("Main Thread Started"+work.isDaemon());
          work.setDaemon(false);
          work.start();
          System.out.println("Main Thread stopped");
class Work extends Thread
     int count=0;
     public Work(int cou)
          super("Workere");
          count=cou;
     public void run()
          while(count-->0)
               System.err.println("Worker Thread is running................");
}Now bydefault work thread is deamon,when all work thread steps executed program finished, tell me here as its concurent execution,
main is alive or die when it execute its all statements or it waits for work thread which it spawned.
Secondly when i change deamon to true, when main statements finished it also stoped work thread.mean work thread just print some messages.
Actually what i want is that, when my main progam ends up, before ending it spawned new thread which start batch script and i want to see its output on seprate screen just like when we run IE with exec it starts IE window.
Hope fully this time its clear