code: public static void drawCircle(Graphics g, int centerX, int centerY, int diameter){
  		g.drawOval((int) (centerX-diameter/2), (int) (centerY-diameter/2), diameter, diameter);
  	}
docs: Draws a circle with the specified diameter using the given point coordinates as center.
  @param g Graphics context
  @param centerX X coordinate of circle center
  @param centerY Y coordinate of circle center
  @param diameter Circle diameter