public class MyRunnable implements Runnable 
{
    public void run() 
    {
        // some code here
    }
}

Which of these will create and start this thread?

Because the class implements Runnable, an instance of it has to be passed to theThread constructor, and then the instance of the Thread has to be started. 1 is incorrect. There is no constructor like this for Runnable because Runnable is an interface, and it is illegal to pass a class or interface name to any constructor. 2 is incorrect for the same reason; you can't pass a class or interface name to any constructor. 4 is incorrect because MyRunnable doesn't have a start() method, and the onlystart() method that can start a thread of execution is the start() in the Threadclass.