java实现的生产者和消费者问题-涉及线程同步与通信

1：共享数据类

 

package com.pb.consumerandproducer;public class ShareData {private char c;  //代表仓库里的产品private boolean isProduced = false;  //是否还有供消费者消费的产品public synchronized void putData(char c) {  //生产者生产产品放入仓库if(isProduced) { //仓库中还有未消费的产品System.out.println("仓库中还有未消费的产品，生产者等待");try {wait();  //将线程挂起} catch (InterruptedException e) {e.printStackTrace();}}this.c = c;isProduced = true;  //标记为已生产notify();   //通知消费者消费，激活消费者线程System.out.println("生产者生产产品" + c + "通知消费者消费");}public synchronized char getData() {  //消费者消费产品if(!isProduced) {  //仓库中没有供消费的产品System.out.println("仓库中没有供消费的产品，消费者等待");try {wait();} catch (InterruptedException e) {e.printStackTrace();}}isProduced = false;   //标记为未生产notify();   //通知生产者生产System.out.println("消费者消费了" + this.c + "通知生产者继续生产");return c;}}

2：生产者线程ProducerThread

package com.pb.consumerandproducer;/** * 生产者线程，每隔一段时间就生产一个产品 * @author ccna_zhang * */public class ProducerThread extends Thread{private ShareData shareData;public ProducerThread(ShareData shareData) {this.shareData = shareData;}public void run() {for(char ch = 'A'; ch <= 'D'; ch++) {try {Thread.sleep((int)(Math.random()*3000));} catch (InterruptedException e) {e.printStackTrace();}shareData.putData(ch);   //把商品放进仓库}}}

3：消费者线程ConsumerThread

package com.pb.consumerandproducer;/** * 消费者线程 * @author ccna_zhang * */public class ConsumerThread extends Thread {private ShareData shareData;public ConsumerThread(ShareData shareData) {this.shareData = shareData;}public void run() {char ch;do {try {Thread.sleep((int)(Math.random()*3000));} catch (InterruptedException e) {e.printStackTrace();}ch = shareData.getData();  //从仓库中取出商品} while(ch != 'D');}}

4：测试类和结果

package com.pb.consumerandproducer;public class TestProcuderAndConsumer {public static void main(String[] args) {ShareData shareData = new ShareData();ConsumerThread consumerThread = new ConsumerThread(shareData);ProducerThread producerThread = new ProducerThread(shareData);consumerThread.start();producerThread.start();}}

结果：

生产者生产产品A通知消费者消费消费者消费了A通知生产者继续生产仓库中没有供消费的产品，消费者等待生产者生产产品B通知消费者消费消费者消费了B通知生产者继续生产仓库中没有供消费的产品，消费者等待生产者生产产品C通知消费者消费消费者消费了C通知生产者继续生产生产者生产产品D通知消费者消费消费者消费了D通知生产者继续生产