•65
hline.paintOn(screen);
•Send paintOn message to Line
hline, which
happens to be an HLine
–No paintOn(Screen) in class
HLine
–Java finds paintOn(Screen) in
parent class Line
–paintOn(Screen) delegates to
paintOn(Screen, int, int)
–paintOn(Screen, int, int) is abstract
in class Line
–Java finds implementation in
class HLine
–