消费者与生产者

package com.xiaobai.shangguigu.Test;


class Clerk {//店员
    private int productNum = 0;//产品的数量

    public synchronized void addProductNum() {
        if (productNum > 20) {
            try {
                wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }else {
            productNum++;
            System.out.println(Thread.currentThread().getName() + "生产了第" + productNum + "个产品");
            notifyAll();
        }
    }

    public synchronized void minusProductNum() {
        if (productNum <= 0) {
            try {
                wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        } else {
            System.out.println(Thread.currentThread().getName() + "消费了第" + productNum + "个产品");
            productNum--;
            notifyAll();
        }

    }
}

class Producer extends Thread {//生产者
    private Clerk clerk;

    public Producer(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        while (true) {
            System.out.println("生产者开始生产");
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            clerk.addProductNum();
        }
    }
}

class Consumer extends Thread {//消费者
    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        while (true) {
            System.out.println("消费者正在消费");
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            clerk.minusProductNum();
        }
    }
}

//生产者和消费者实例
public class ProducerConsumerTest {


    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        Producer producer = new Producer(clerk);
        Consumer consumer = new Consumer(clerk);
        producer.setName("生产者1");
        consumer.setName("消费者1");
        producer.start();
        consumer.start();
    }
}