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How do I run my java program off screen and update the view when I ask it to?


The concept you're looking for is known as double buffering. In general, the concept is that you have an off-screen buffer that you do your graphical operations to, then copy the off-screen buffer to the on-screen display.

I don't know exactly what graphical toolkit you're using for your work. AWT can do this with Graphics.drawImage(). See Double Buffering with awt for one discussion of how to do this. In Swing, this can be handled with JComponent.setDoubleBuffered()

If you are using something else, you may wish to look it up using the exact phrase "double buffering".

Update:

The other answer, of course, is to not clear the entire screen and redraw. Given how the pong objects move, you should be able to clear just the portion of each paddle and ball that has moved.


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