Question

Making this paintbrush program I decided I want to clear the panel container (panel2 in the linked code). I used PanelName.setForeground(null) and it worked. What I’d like to know is if there are known drawbacks of this approach and other ways of removing graphics objects from the container.

Answer 1

If you override paintComponent, you can clear its Graphics using Graphics#clearRect. But overall, I prefer your approach because mine would require you to either subclass JPanel, or anonymously declare one.