线程间通讯学习【六】

最新推荐文章于 2025-05-30 17:14:35 发布

原创最新推荐文章于 2025-05-30 17:14:35 发布 · 91 阅读

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#thread #多线程

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package com.zzl.thread;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
 * 线程间通讯-生产者、消费者 jdk5.0升级版
 * jdk1.5 中提供了多线程升级解决方案。
 * 将同步的  synchronized  替换成显示的 Lock操作。
 * 讲Object中的 wait notify notifyAll 替换成Condition对象
 * 该Condition对象可以通过Lock锁的 newCondition()方法进行获取
 * 
 * @author zzl
 *
 */
class MyResource {
	private String name;
	private int number = 1;
	private boolean flag = false;
	private Lock lock = new ReentrantLock();
	private Condition condition_producer = lock.newCondition();
	private Condition condition_consumer = lock.newCondition();
	//资源的生产
	public  void set(String name) {
		//拿到锁
		lock.lock();
		try {
			while (flag) {
				try {
					//生产的Condition await;
					condition_producer.await();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			this.name = name + "......" + number++;
			System.out.println(Thread.currentThread().getName() + "...生产者..."
					+ this.name);
			this.flag = true;
			//消费的Condition唤醒
			condition_consumer.signal();
		} finally {
			//释放锁
			lock.unlock();
		}

	}
	//资源的消费
	public void print() {
		//拿到锁
		lock.lock();
		try {
			while (!flag) {
				try {
					//消费的Condition await;
					condition_consumer.await();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			System.out.println(Thread.currentThread().getName()
					+ "---------消费者---------" + this.name);
			this.flag = false;
			//生产的Condition唤醒
			condition_producer.signal();
		} finally {
			//释放锁
			lock.unlock();
		}

	}

}

class Producer implements Runnable {
	private MyResource r;

	public Producer(MyResource r) {
		this.r = r;
	}

	@Override
	public void run() {
		while (true) {
			r.set("苹果");
		}

	}

}

class Consumer implements Runnable {
	private MyResource r;

	public Consumer(MyResource r) {
		this.r = r;
	}

	@Override
	public void run() {
		while (true) {
			r.print();
		}
	}

}

public class ProducerConsumerDemo {

	public static void main(String[] args) {
		MyResource r = new MyResource();
		Producer p = new Producer(r);
		Consumer c = new Consumer(r);
		Thread t1 = new Thread(p);
		Thread t2 = new Thread(p);
		Thread t3 = new Thread(c);
		Thread t4 = new Thread(c);
		t1.start();
		t2.start();
		t3.start();
		t4.start();
	}

}

运行效果：

Thread-0...生产者...苹果......37809
Thread-2---------消费者---------苹果......37809
Thread-1...生产者...苹果......37810
Thread-3---------消费者---------苹果......37810
Thread-0...生产者...苹果......37811
Thread-2---------消费者---------苹果......37811
Thread-1...生产者...苹果......37812
Thread-3---------消费者---------苹果......37812
Thread-0...生产者...苹果......37813
Thread-2---------消费者---------苹果......37813
Thread-1...生产者...苹果......37814
Thread-3---------消费者---------苹果......37814
Thread-0...生产者...苹果......37815
Thread-2---------消费者---------苹果......37815