New to Java

I've created a basic program, with 4 additional classes, I need to create uml class diagrams for these, I just want something where you can type in all the attributes and methods and then it creates the diagram.
I have MS visio 2007, but this only caters for C++ and C#, one of my classes has a vector as an attribute so its no good.
I have netbeans and eclipse installed but they seem pretty hard to work out, you need to have a package to create a diagram. I don't have a clue about packages
can anyone recommend a program that works in a similar way to visio but supports java, or is there a plugin to make visio 2007 create java uml class diagrams

thanks

Paul