使用Java实现的简易“生产者消费者问题”

<pre name="code" class="java">/* *  *  * 生产者与消费者问题。 * 要求：每生产出一个产品，消费一个产品。 * 为了保证产品P的唯一性，采用构造方法的方式传递进去。 * */class product {String name;Double price;boolean flag = false;}class Producer extends Thread {product p;int i = 0;public Producer(product p) {this.p = p;}public void run() {while (true) {synchronized (p) {if (!p.flag) {if (i % 2 == 0) {p.name = "Cola";p.price = 2.5;System.out.println("生产了一个" + p.name + "价格是" + p.price);p.flag = true;p.notify();// 唤醒消费者进程，必须用锁对象调用i++;} else {p.name = "Fanta";p.price = 2.6;System.out.println("生产了一个" + p.name + "价格是" + p.price);p.flag = true;p.notify();i++;}} else {try {p.wait();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} // 等待消费者消费}}}}}class Customer extends Thread {product p;public Customer(product p) {this.p = p;}public void run() {while (true) {synchronized (p) {if (p.flag) {System.out.println("消费了一个" + p.name);p.flag = false;p.notify();// 消费完毕，唤醒生产者生产。} else {try {p.wait();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}}public class Demo2 {public static void main(String[] args) {// TODO Auto-generated method stubproduct p = new product();Producer producer = new Producer(p);Customer customer = new Customer(p);producer.start();customer.start();}}