File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes How is main  a thread Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "How is main  a thread" Watch "How is main  a thread" New topic

How is main a thread

Harvinder Singh
Ranch Hand

Joined: Feb 14, 2003
Posts: 90
Hi Java'sSocialWorkers:-),
A class that has a main() method may or may not implement the Runnable Interface or extend the Thread class then how the main() is called the first
non-daemon thread that JMV runs when the class is loaded.further the JVM only calls the run() method of the class to which the thread belongs.

Hard work beats talent<br />when talent doesn't work hard.<p> - Tim Notke
Jose Botella
Ranch Hand

Joined: Jul 03, 2001
Posts: 2120
The thread that executes an application has been named "main" because it executes the code in the main method. The class holding the main method is not otherwise related to this thread.

SCJP2. Please Indent your code using UBB Code
Marlene Miller
Ranch Hand

Joined: Mar 05, 2003
Posts: 1391
How is main a thread?
Even if the virtual machine is not actually coded this way, it seems like a reasonable way the virtual machine could start the main thread:

The idea here is that the virtual machine (theoretically) creates a Runnable object that invokes the static method main. Then it creates a Thread object and passes that Runnable object as the thread target.
Notice how this can explain why we can throw checked exceptions from main().
Why am I spreading such myths? Until I find out how it really works, this is how I explain to myself how the main thread is just like any other thread. But I defer to Jose, our virtual machine expert.
[ October 06, 2003: Message edited by: Marlene Miller ]
I agree. Here's the link:
subject: How is main a thread
jQuery in Action, 3rd edition