threaded progames

So guys I hear of many people saying single threaded programs suck. I personally program in java and i have a question. Even when i make a single thread program in java and then look @ it via jconsole it appears to have ~5-10 threads up at any time. Does that mean it's already multi-threaded and really wouldn't make a shit load of a difference since i'm already using multiple cores?

>>9
Ever heard of the term concurrency?

For instance, I wrote a 4chan image scraper. Single threaded it would take unbelievably fucking long to finish. Multi threaded finishes in a fraction of the time.