java多线程总结六：经典生产者消费者问题实现

这是个线程同步的经典例子，源代码如下：

 

<span style="font-size:16px;">package demo.thread;

/**
 *经典生产者与消费者问题：生产者不断的往仓库中存放产品，消费者从仓库中消费产品。
 *其中生产者和消费者都可以有若干个。仓库容量有限，库满时不能存放，库空时不能取产品
 */

public class ProducersAndConsumers {
    public static void main(String[] args) {
        Storage storage = new Storage();
        Thread consumer = new Thread(new Consumer(storage));
        consumer.setName("消费者");
        Thread producer = new Thread(new Producer(storage));
        producer.setName("生产者");
        consumer.start();
        producer.start();
    }
}

/**
 * 消费者
 */
class Consumer implements Runnable {
    private Storage storage;

    public Consumer(Storage storage) {
        this.storage = storage;
    }

    @Override
    public void run() {
        storage.pop();
    }
}

/**
 * 生产者
 */
class Producer implements Runnable {
    private Storage storage;

    public Producer(Storage storage) {
        this.storage = storage;
    }

    @Override
    public void run() {
        Product product = new Product("090505105", "电话");
        storage.push(product);
    }

}

/**
 * 产品类
 */
class Product {
    private String id;// 产品id
    private String name;// 产品名称

    public Product(String id, String name) {
        this.id = id;
        this.name = name;
    }

    @Override
    public String toString() {
        return "(产品ID：" + id + " 产品名称：" + name + ")";
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

/**
 *仓库
 */
class Storage {
    // 仓库容量为10
    private Product[] products = new Product[10];
    private int top = 0;

    // 生产者往仓库中放入产品
    public synchronized void push(Product product) {
        while (top == products.length) {
            try {
                wait();//仓库已满，等待
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        //把产品放入仓库
        products[top++] = product;
        System.out.println(Thread.currentThread().getName() + " 生产了产品"
                + product);
        notifyAll();//唤醒等待线程

    }

    // 消费者从仓库中取出产品
    public synchronized Product pop() {
        while (top == 0) {
            try {
                wait();//仓库空，等待
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

        //从仓库中取产品
        --top;
        Product p = new Product(products[top].getId(), products[top].getName());
        products[top] = null;
        System.out.println(Thread.currentThread().getName() + " 消费了产品" + p);
        notifyAll();//唤醒等待线程
        return p;
    }
}
</span>

 

 

运行结果：

生产者 生产了产品(产品ID：090505105 产品名称：电话)
消费者 消费了产品(产品ID：090505105 产品名称：电话)