general query on thread api java doc

[gurpeet singh]

please refer the link http://docs.oracle.com/javase/6/docs/api/java/lang/Thread.html#run(). the javadocs for the run() method says that

public void run()
If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.
Subclasses of Thread should override this method.

what does it mean by SEPARATE RUNNABLE RUN OBJECT ?

Second part of my question is that suppose i have following snippet of code :

public MyRunnable implements Runnable {

public void run(){}
}

public class Play{

public static void main(String... args)
{
MyRunnable r = new MyRunnable();
Thread t = new Thread(r);    // is "r" the separate runnable object the above javadoc is talking about ?
t.start();                // it will invoke r's run method as said by javadocs above .
}
}

as mentioned in comments, is "r" the separate runnable object the above javadoc is talking about ?

thirdly, if we have something like this

public class Mythread extends Thread{
public void run()
{
}
public static void main(String...args)
{

Mythread t = new Mythread();             // here is t the target runnable as said by above javadocs ?
t.start();       

}
}

here what is target runnable ? is it t (since t also implements Runnable) ?

[Sumit Patil]

Please do not post duplicate posts, give some time to the members to answer your query.

[gurpeet singh]

thanks sumit. I thought maybe the thread has fallen in the black hole and since the post was also focusing on separate issue, so started a new thread.

[Helen Ma]

Mythread is a runnable because Thread is a Runnable. I think t.start() executes the run () method of Mythread.