Multiple-Person Bumper Car Ride Monitor

This is Exercise 5.14 in the text. Remember that Java monitors are `signal and continue' so be sure to think about the ramifications of this as you design your monitor.

No semaphores and no busy waiting allowed! Do not use nap() within a monitor synchronized method. Do you see why? Only three nap()'s are allowed in this program: riders wandering, cars bumping, and one in main() to shutdown the simulation.

If you have not already done so, animate your program using