class ProducerConsumerDemo//二个线程同时运行,同步机制,生产者和消费者
{
public static void main(String[] args)
{
Res r = new Res();
Pro p = new Pro(r);
Con c = new Con(r);
Thread t1 = new Thread(p);
Thread t2 = new Thread(p);
Thread t3 = new Thread(c);
Thread t4 = new Thread(c);