how should i use my knowledge of a computer langague

I would recommend looking into website building with java. Or at least branching off into javascript based languages.

Java is an archaic language now a days and should be put down. But for some reason people love to use it for anything. VMware is HEAVY into java as well (or at least their toolkits such as VSM) and there could be some serious money in that if you get into their troubleshooting efforts.

Basically, find a niche and just stick with it. You can always learn more.