Calling run method of classes(either extended by thread class or implemented by runnable interface)?

none.

- your code is not valid (SOP???)
- Runnable is an interface (implements not extends - unless MyRunnable is an Interface too, of course.)

and the main reason is that the class MyMain will not run because it does not have main function.


BUT when you modify that to be a valid code (with 3 separate classes!):

public class MyMain {
	public static MyThread oThread = new MyThread(new MyRunnable());

	public static void main(String[] args) {
		oThread.start();
	}

}

class MyThread extends Thread {
	MyThread(Runnable r) {
		super(r);
	}

	@Override
	public void run() {
		System.out.println("my thread runs.");
	}
}

class MyRunnable implements Runnable {
	@Override
	public void run() {
		System.out.print("my runnable runs.");
	}
}

The Thread is running. Why?
Check the code - it's overriding the run() method from the Runnable.
If you remove the run method from the Thread the runnable's run method is getting it's chance to run.

EDIT: struggled a little with the code highlighting...