Enthuware

I did not understand why it executes Pooler's run(). A new Threader() is passed to Pooler's run(Runnable r). Then super(r) calls run() of Thread class that executes Runnable's run(). Since Runnable r contains Threader object it should be printing 'In threader'.

Where am I going wrong?

Why do you think "then super(r) calls run() of Thread class"?

Pooler extends Thread so call to super(r) will execute run(Runnable) of Thread.

Again, why do you think that super(r) will execute run(Runnable) at all? Thread's run is called when you start a thread, not when you create a thread.

I got it now. Will h.start() call Pooler's run() method directly because h has been assigned a Pooler object?

That is correct. But go through the explanation again for more clarity.