多线程-生产者消费者（lock同步）

二、采用Lock锁以及await和signal方法是实现

import java.io.IOException;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author 作者 E-mail:
 * @version 创建时间：2015-10-23 下午04:08:39 类说明
 */
public class AwaitAndSignal
{
    public static void main(String[] args) throws IOException
    {
        Person person = new Person();
        new Thread(new Consumer(person), "消费者一").start();
        new Thread(new Consumer(person), "消费者二").start();
        new Thread(new Consumer(person), "消费者三").start();

        new Thread(new Producer(person), "生产者一").start();
        new Thread(new Producer(person), "生产者一").start();
        new Thread(new Producer(person), "生产者一").start();
    }
}

class Producer implements Runnable
{
    private Person person;

    public Producer(Person person)
    {
        this.person = person;
    }

    @Override
    public void run()
    {

        for (int i = 0; i < 10; i++)
        {
            person.produce();
        }

    }

}

class Consumer implements Runnable
{

    private Person person;

    public Consumer(Person person)
    {
        this.person = person;
    }

    @Override
    public void run()
    {

        for (int i = 0; i < 10; i++)
        {
            person.consume();
        }

    }

}

class Person
{
    private int foodNum = 0;

    private ReentrantLock lock = new ReentrantLock();

    private Condition condition = lock.newCondition();

    private final int MAX_NUM = 5;

    public void produce()
    {
        lock.lock();
        try
        {
            while (foodNum == MAX_NUM)
            {
                System.out.println("box is full，size = " + foodNum);
                condition.await();
            }
            foodNum++;
            System.out.println("produce success foodNum = " + foodNum);
            condition.signalAll();
        }
        catch(InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }

    }

    public void consume()
    {
        lock.lock();
        try
        {
            while (foodNum == 0)
            {
                System.out.println("box is empty,size = " + foodNum);
                condition.await();
            }
            foodNum--;
            System.out.println("consume success foodNum = " + foodNum);
            condition.signalAll();
        }
        catch(InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }

    }
}