Intro to Java Programming, Brief Version (10th Edition)

* Chapter 15 Exercise 19:
	* Using java.fx
	* (Game: eye-hand coordination)
	* Write a program that displays a circle of radius 10 pixels filled
	* with a random color at a random location on a pane, as shown in
	* Figure 15.29b. When you click the circle, it disappears and a new
	* random- color circle is displayed at another random location. After twenty
	* circles are clicked, display the time spent in the pane, as shown in Figure 15.29c.
	*