Help with a JPanel

Hiya, I think this is a fairly common JPanel related question and would
love any help,

I want to store the width,height,x/y coords of a rectangle in an
object, then draw it onto a JPanel. (I can get this far)
I also want to be able to change the width/height/x/y of the rectangle
then have it redrawn. (Im stuck at this point)

Do I have to call some kind of redraw command on the JPanel to have it
updated? Or do I do it on the rectangle itself? Or some other way
perhas?

Pretty stuck, any sample code would be great

Thanks,
Chris

.

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