Hey guys, what about setResizable( false )?
This disables resizing the frame by dragging on it's borders or clicking on its title bar, and it disables the maximize button on the frame.
The previous posts are correct if you are trying to disable the
minimize button on the JFrame ( you can kinda disable this by making it listen for the event and then restore the frame ), but minimizing doesn't resize the frame anyway, so this shouldn't be a problem...
-Nate