Thread vs Runnable interface

[tcstcs]

"The most important difference is - When you extend a thread each of your threads has a unique object associated with it, whereas with Runnable, many threads share the same object instance."

Can someone explains me how the Runnable interface shares shares same instance more than once?

[Norm]

You can pass a reference to a class that extends Runnable to more than one Thread object.

Runnable rnbl = new Runnable();
new Thread(rnbl);
new Thread(rnbl);
new Thread(rnbl);

The three threads will share the one Runnable.

[tcstcs]

Thanks Norm.