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对于多线程程序来说,不管任何编程语言,生产者和消费者模型都是最经典的。就像学习每一门编程语言一样,Hello World!都是最经典的例子。
实际上,准确说应该是“生产者-消费者-仓储”模型,离开了仓储,生产者消费者模型就显得没有说服力了。
对于此模型,应该明确一下几点:
1、生产者仅仅在仓储未满时候生产,仓满则停止生产。
2、消费者仅仅在仓储有产品时候才能消费,仓空则等待。
3、当消费者发现仓储没产品可消费时候会通知生产者生产。
4、生产者在生产出可消费产品时候,应该通知等待的消费者去消费。
package cn.thread; import java.util.concurrent.BlockingQueue; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.LinkedBlockingQueue; /** * java多线程模拟生产者消费者问题 * * ProducerConsumer是主类,Producer生产者,Consumer消费者,Product产品,Storage仓库 * * @author 林计钦 * @version 1.0 2013-7-24 下午04:49:02 */ public class ProducerConsumer { public static void main(String[] args) { ProducerConsumer pc = new ProducerConsumer(); Storage s = pc.new Storage(); ExecutorService service = Executors.newCachedThreadPool(); Producer p = pc.new Producer("张三", s); Producer p2 = pc.new Producer("李四", s); Consumer c = pc.new Consumer("王五", s); Consumer c2 = pc.new Consumer("老刘", s); Consumer c3 = pc.new Consumer("老林", s); service.submit(p); //service.submit(p2); service.submit(c); service.submit(c2); service.submit(c3); } /** * 消费者 * * @author 林计钦 * @version 1.0 2013-7-24 下午04:53:30 */ class Consumer implements Runnable { private String name; private Storage s = null; public Consumer(String name, Storage s) { this.name = name; this.s = s; } public void run() { try { while (true) { System.out.println(name + "准备消费产品."); Product product = s.pop(); System.out.println(name + "已消费(" + product.toString() + ")."); System.out.println("==============="); Thread.sleep(500); } } catch (InterruptedException e) { e.printStackTrace(); } } } /** * 生产者 * * @author 林计钦 * @version 1.0 2013-7-24 下午04:53:44 */ class Producer implements Runnable { private String name; private Storage s = null; public Producer(String name, Storage s) { this.name = name; this.s = s; } public void run() { try { while (true) { Product product = new Product((int) (Math.random() * 10000)); // 产生0~9999随机整数 System.out.println(name + "准备生产(" + product.toString() + ")."); s.push(product); System.out.println(name + "已生产(" + product.toString() + ")."); System.out.println("==============="); Thread.sleep(500); } } catch (InterruptedException e1) { e1.printStackTrace(); } } } /** * 仓库,用来存放产品 * * @author 林计钦 * @version 1.0 2013-7-24 下午04:54:16 */ public class Storage { BlockingQueue<Product> queues = new LinkedBlockingQueue<Product>(10); /** * 生产 * * @param p * 产品 * @throws InterruptedException */ public void push(Product p) throws InterruptedException { queues.put(p); } /** * 消费 * * @return 产品 * @throws InterruptedException */ public Product pop() throws InterruptedException { return queues.take(); } } /** * 产品 * * @author 林计钦 * @version 1.0 2013-7-24 下午04:54:04 */ public class Product { private int id; public Product(int id) { this.id = id; } public String toString() {// 重写toString方法 return "产品:" + this.id; } } }
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原文地址:http://www.cnblogs.com/wenfei123chai/p/4253506.html