I'll second that. In short, just update it. (It should have a hot cup of something (Java lava is it?) with swirls above it as the logo.)
It is just a language devised by Sun Microsystems to allow programs written in it to run on multiple devices. It is deliberately restricted in what it can do to your computer. Some websites have small Java "applets" on them to provide functionality that you can't get with a normal browser software. (e.g web cam control, control of a scanner through a browser, etc.)
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Java question 
Java question