I am fond of Eclipse myself, but I would advise you as a "greenhorn" not to use it.
Why? Simple: you have quite enough to learn with Java without struggling with a large unfamiliar app at the same time.
I have used JGrasp myself, and prefer Eclipse greatly.
I suggest you try something like JCreatorLE (available from
this website, which is a posh editor, available free of charge.
The nice thing about JCreator is that it helps with editing, eg matching brackets and braces, and identing, but is almost as easy to use as a text editor.
And should you need a UML diagram, there are panels in JCreator which show all the fields and methods of your class.
Once you have got experienced with Java, and want a full-blown IDE, Eclipse and NetBeans are both good, though I personally prefer Eclipse.
CR