Java IDE

I'm taking a CS class that teaches basic Java concept. (Sob, we don't get to arrays until November and the semester is over in December.) Anyway they use JCreator on Windows, but in my home/office I am almost exclusive Linux/Ubuntu. I know that there are a number of Java IDE for Linux, but ideally I would like something kind of basic.

Does anyone know of a basic IDE for Java that is simple and easy to use?

I'm looking for experience here, I know I could use Google/Synaptic and find one, but I need experience.

Thanks in advance.