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    public void prePaint() {        BufferStrategy bf = f.getBufferStrategy();	Graphics g = null;		try {		g = bf.getDrawGraphics();				// It is assumed that mySprite is created somewhere else.		// This is just an example for passing off the Graphics object.		this.paintAll(g);			} finally {		// It is best to dispose() a Graphics object when done with it.		g.dispose();	}		// Shows the contents of the backbuffer on the screen.	bf.show();                    }