Question: Overload the drawCircle method of Exercise such that if the Color parameter is not provided, the circle's color will default to black.
Exercise: Write a method called drawCircle that draws a circle based on the method's parameters: a Graphics object through which to draw the circle, two integer values representing the (x, y) coordinates of the center of the circle, another integer that represents the circle's radius, and a Color object that defines the circle's color. The method does not return anything.