AWT: Why not call update() directly?

[Marc Twain]

I know there must be a good reason, but why not call update() directly
since repaint() only schedules a call to it later on?

TIA,

AJ.

 

[Roedy Green]

I know there must be a good reason, but why not call update() directly
since repaint() only schedules a call to it later on?

Because with repaint, procrastination means you often can avoid the
work, since several repaints can be collapsed into one.

Repaint has a clip region, so it only paints what really needs it.

You have to co-ordinate your painting with the repaints generated by
the user dragging and clicking. Hence the queue.