Java 单生产者消费者问题

package com.cwcec.test;

class Resource
{
    private int count = 0;
    private boolean flag = false;

    public synchronized void set(int count)
    {
        if(flag)
        {
            try {
                this.wait();
            } catch (InterruptedException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
        }
        this.count = count;
        flag = true;
        System.out.println(Thread.currentThread().getName() + "...生产者..." + count);
        this.notify();
    }

    public synchronized void out()
    {
        if(!flag)
        {
            try {
                this.wait();
            } catch (InterruptedException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + "...消费者..." + count);
        flag = false;
        this.notify();
    }

}

class Producer implements Runnable
{
    private Resource r;
    public Producer(Resource r)
    {
        this.r = r;
    }

    public void run()
    {
        int x = 0;
        while(true)
        {
            r.set( ++x);
        }
    }
}

class Customer implements Runnable
{
    Resource r;
    public Customer(Resource r)
    {
        this.r = r;

    }

    public void run()
    {
        while(true)
        {
            r.out();
        }
    }
}

public class Person {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        Resource r = new Resource();
        Producer p = new Producer(r);
        Customer c = new Customer(r);

        Thread t1 = new Thread(p);
        Thread t2 = new Thread(c);

        t1.start();
        t2.start();
    }
}

Output：

Thread-0...生产者...61498

Thread-1...消费者...61498

Thread-0...生产者...61499

Thread-1...消费者...61499

Thread-0...生产者...61500

Thread-1...消费者...61500

Thread-0...生产者...61501

Thread-1...消费者...61501

Thread-0...生产者...61502

Thread-1...消费者...61502

Thread-0...生产者...61503

Thread-1...消费者...61503