Chapter 14, Problem 14.28PE

(Random time) Modify the ClockPane class with three new Boolean properties—hourHandVisible, minuteHandVisible, and secondHandVisib1e—and their associated accessor and mutator methods. You can use the set methods to make a hand visible or invisible. Write a test program that displays only the hour and minute hands. The hour and minute values are randomly generated. The hour is between 0 and 11, and the minute is either 0 or 30, as shown in Figure 14.52b.