简单的生产者消费者问题

box

点击查看代码

package it_07;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class Box {
    private int milk;
    private boolean state = false;
    private Lock lock = new ReentrantLock();

    public synchronized void put(int milk){

        //如果有产品那就等待消费
        if(state){
            try {
                wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
        //没有就生产
        this.milk = milk;
        System.out.println("生产者生产了第"+milk+"瓶");
        //修改状态
        state=true;

        //唤醒其他等待的线程
        notifyAll();

    }

    public synchronized void get(){

        //如果没有产品就等待
        if(!state) {
            try {
                wait();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
        //有就消费
        System.out.println("消费者获得了第"+milk+"瓶");
        //修改状态
        state = false;

        //唤醒其他等待的线程
        notifyAll();
    }
}

producer

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package it_07;

public class Producer implements Runnable{
    private Box box;

    public Producer(Box box) {
        this.box=box;
    }

    @Override
    public void run() {
        for(int i=1;i<=5;i++){
            box.put(i);
        }
    }
}

customer

点击查看代码

package it_07;

public class Customer implements Runnable{
    private Box box;
    public Customer(Box box) {
        this.box=box;
    }

    @Override
    public void run() {
        while(true){
            box.get();
        }
    }
}

测试

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package it_07;

public class Demo1 {
    public static void main(String[] args) {

        //创建box，共享数据区
        Box box = new Box();
        //创建生产者对象
        Producer producer = new Producer(box);
        //创建消费者对象
        Customer customer = new Customer(box);

        Thread p = new Thread(producer);
        Thread c = new Thread(customer);
        p.start();
        c.start();
    }
}