使用synchronized/wait/notify实现生产者消费者模式

代码：

//模拟生产和消费的对象
class Buffer {
    private int maxSize;
    private List storage;
    Buffer(int size){
        maxSize=size;
        storage=new LinkedList<>();
    }
    //生产方法
    public synchronized void put()  {
        try {
            while (storage.size() ==maxSize ){//如果队列满了
                System.out.print(Thread.currentThread().getName()+": wait \n");;
                wait();//阻塞线程
            }
            storage.add(new Date());
            System.out.print(Thread.currentThread().getName()+": put:"+storage.size()+ "\n");
            Thread.sleep(5000);
            notifyAll();//唤起线程
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    //消费方法
    public synchronized void take() {
        try {
            while (storage.size() == 0){//如果队列满了
                System.out.print(Thread.currentThread().getName()+": wait \n");;
                wait();//阻塞线程
            }
            Date d=((LinkedList)storage).poll();
            System.out.print(Thread.currentThread().getName()+": take:"+storage.size()+ "\n");
            Thread.sleep(5000);
            notifyAll();//唤起线程
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}
//生产者
class Producer implements Runnable{
    private Buffer buffer;
    Producer(Buffer b){
        buffer=b;
    }
    @Override
    public void run() {
        while(true){
            buffer.put();
        }
    }
}
//消费者
class Consumer implements Runnable{
    private Buffer buffer;
    Consumer(Buffer b){
        buffer=b;
    }
    @Override
    public void run() {
        while(true){
            buffer.take();
        }
    }
}
public class Main {
    public static void main(String[] arg){
        Buffer buffer = new Buffer(10);
        Producer producer = new Producer(buffer);
        Consumer consumer = new Consumer(buffer);
        //创建线程执行生产和消费
        for(int i=0;i<3;i++){
            new Thread(producer,"producer-"+i).start();
        }
        for(int i=0;i<3;i++){
            new Thread(consumer,"consumer-"+i).start();
        }
    }
}

执行结果：

producer-0: put:1
producer-0: put:2
consumer-2: take:1
consumer-2: take:0
consumer-2: wait 
consumer-1: wait 
producer-1: put:1
producer-1: put:2
producer-1: put:3
producer-1: put:4
producer-1: put:5
consumer-0: take:4
consumer-0: take:3
consumer-0: take:2
consumer-0: take:1
consumer-0: take:0
consumer-0: wait 
producer-2: put:1
consumer-0: take:0
consumer-0: wait 
producer-1: put:1
producer-1: put:2
producer-1: put:3
consumer-1: take:2
consumer-1: take:1
consumer-1: take:0
consumer-1: wait 
consumer-2: wait 
producer-0: put:1
consumer-2: take:0
consumer-2: wait 
consumer-1: wait 
producer-1: put:1
producer-1: put:2
producer-1: put:3
producer-1: put:4
producer-1: put:5
consumer-0: take:4
consumer-0: take:3
producer-2: put:4
producer-2: put:5
producer-2: put:6
producer-2: put:7
consumer-0: take:6
consumer-0: take:5
consumer-0: take:4

完毕。