java多线程-生产者和消费者问题

经典生产者消费者问题：

/*
线程通信的应用
分析：
1.是否是多线程问题？是，生产者线程，消费者线程
2.是否有共享数据？是，产品
3.如何解决线程安全问题？同步机制，有三种方法
4.是否涉及到线程的通信？是
 */
public class ProductTest {

    public static void main(String[] args) {
        Clerk clerk = new Clerk();

        Producer p1 = new Producer(clerk);
        p1.setName("生产者1");

        Consumer c1 = new Consumer(clerk);
        c1.setName("消费者1");

        Consumer c2 = new Consumer(clerk);
        c2.setName("消费者2");

        p1.start();
        c1.start();
        c2.start();

    }
}

class Clerk {

    private int count = 0;

    //生产产品
    public synchronized void produceProduct() {

        if (count < 20) {
            count++;
            System.out.println(Thread.currentThread().getName() + "开始生产第" + count + "个产品");

            notify();
        } else {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    //消费产品
    public synchronized void consumeProduct() {

        if (count > 0) {

            System.out.println(Thread.currentThread().getName() + "开始消费第" + count + "个产品");
            count--;
            notify();
        } else {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

class Producer extends Thread {//生产者

    private Clerk clerk;

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

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "开始生产产品.......");

        while (true) {

            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.produceProduct();
        }
    }
}


class Consumer extends Thread {//消费者

    private Clerk clerk;

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

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "开始消费产品.......");

        while (true) {

            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.consumeProduct();
        }
    }
}