Lock 生产者消费者模型示例

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package com.expgiga.JUC;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** * 生产者消费者案例 */public class TestProductorAndConsumerForLock {    public static void main(String[] args) {        Clerk clerk = new Clerk();        Productor productor = new Productor(clerk);        Consumer consumer = new Consumer(clerk);        new Thread(productor, "生产者A").start();        new Thread(consumer, "消费者B").start();        new Thread(productor, "生产者C").start();        new Thread(consumer, "消费者D").start();    }}//店员class Clerk {    private int product = 0;    private Lock lock = new ReentrantLock();    private Condition condition = lock.newCondition();    //进货方法    public void get() {        lock.lock();        try {            while (product >= 1) { //为了避免虚假唤醒，应该总是使用在循环中                System.out.println("产品已满！");                try {                    condition.await();                } catch (InterruptedException e) {                    e.printStackTrace();                }            }            System.out.println(Thread.currentThread().getName() + " : " + ++product);            condition.signalAll();        } finally {            lock.unlock();        }    }    //卖货方法    public void sale() {        lock.lock();        try {            while (product <= 0) {                System.out.println("产品缺货！");                try {                    condition.await();                } catch (InterruptedException e) {                    e.printStackTrace();                }            }            System.out.println(Thread.currentThread().getName() + " : " + --product);            condition.signalAll();        } finally {            lock.unlock();        }    }}//生产者class Productor implements Runnable {    private Clerk clerk;    public Productor(Clerk clerk) {        this.clerk = clerk;    }    @Override    public void run() {        for (int i = 0; i < 20; i++) {            try {                Thread.sleep(200);            } catch (InterruptedException e) {                e.printStackTrace();            }            clerk.get();        }    }}//消费者class Consumer implements Runnable {    private Clerk clerk;    public Consumer(Clerk clerk) {        this.clerk = clerk;    }    @Override    public void run() {        for (int i = 0; i < 20; i++) {            clerk.sale();        }    }}
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