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Glad to be of help.

@Override
public void mouseClicked(MouseEvent e){
Grid.this.repaint();//
}

Should be quite feasible with just a GridLayout or GridBagLayout. A Visual Guide to Layout Managers

Can you elaborate a bit more on what you mean by an interactive Grid GUI? What I would envision is something like a checkerboard type of grid, where the squares can be moved around (which could be...