Runnable vs. Thread in Java

Runnable (an interface you implement) vs. Thread (an class you extend): Basically, always use Runnable. It's less tied to a concurrency model (meaning it works with Threads and Futures) and allows reuse of threads. Executors work with Threads and Futures... well, technically only with Runnables, but Thread and FutureTask both implement Runnable. A big fan of futures suggested 'Future f = new FutureTask<object>(runnable, null)', but I think that's pretty ugly.