说明：  在学习Java的多线程时，对于其并发控制的实现，一直是初学者的难点。本实例中，详细的实现了Wait与notify的使用方法与技巧。对初学者具有比强的参考价值。
(Learn Java in the multi-threaded, for the realization of its concurrency control has always been difficult for beginners. The examples in detail the realization of the Wait and notify the use of methods and techniques. For beginners stronger than reference value.)