I barely started learning java. Just been reading a book I bought and messing around with the language and like it. I want to goto college and get my bachelors in programming if I choose to mainly learn java what kind of stuff will I mainly be doing with java. I know theirs applets and servelets and you can make desktop applications but what does the "Industry" mainly use java for. Any advice would be greatly appreciated.
Applets have largely fallen out of favor, and there aren't all that many successful Java desktop applications. Web and server applications are where Java is huge. If you want to get into that, download and run Apache Tomcat, and check out the servlet and JSP examples that come with it in order to get a taste of Java web development.
Java is used by many, many companies all around the world for all kinds of business systems. As Ulf said, most of Java's success is in software that runs on enterprise servers, not on desktop computers. There are many big websites, for example online shops, that have been programmed in Java.
Over the past 12 years I've worked on many different systems, for example a big system for an energy company to enable people to automatically switch from one energy provider to another and an information system for the railways, that prepares information for the screens on the stations with information for travellers.
So, Java is really used for all kinds of things in all kinds of businesses.