Confusion with java threads

While using threads I faced a little confusion (for you all) regarding communication between user created threads.

We all know that a communication can be establised b/w threads by using port based communication, shared objects, sokets etc. But if we dont use any of these then how a thead informs other threads that it has been executed and resource is free to use by others?

Is any daemon thread is created automatically to manage this? I just guess.

Make it little for me also!!

thanks

[520 byte] By [rahulapva] at [2007-11-27 9:14:25]