OS 多个生产者--消费者间线程通信

class ProducerConsumeerDemo
{
    public static void main(String[] args)
    {
        Resource r = new Resource();
        Producer pro = new Producer(r);
        Consumer con = new Consumer(r);
　　　　 Producer pro2 = new Producer(r); 
　　　　 Consumer con2 = new Consumer(r);
        
        Thread t1 = new Thread(pro);
        Thread t2 = new Thread(pro2);
　　　 　Thread t3 = new Thread(con);
　　　　 Thread t4 = new Thread(con2);

        
        t1.start();
        t2.start();
        //System.out.println();
    }
}

class Resource  
{
    private String name;    
    private int count =1 ;
    private boolean flag = false;
    
    public synchronized void set(String name)
    {
        while(flag)
            try{wait();} catch(Exception e){}
        this.name = name + "---" + count++;
        
        System.out.println(Thread.currentThread().getName()+ "--111----Producer" +this.name);
        flag = true;
        this.notifyAll();
        
    }
    
    public synchronized void out()
    {
        while(!flag)
            try{wait();} catch(Exception e){}
        System.out.println(Thread.currentThread().getName()+ "--222--Consumer"+this.name);
        flag = false;
        this.notifyAll();//this指的是资源对象，锁即资源
    }
}

class Producer implements Runnable
{
    private Resource res;
    
    Producer(Resource res)
    {
        this.res =  res;
    }
    public void run()
    {
        while(true)
            res.set("+33");
    }
}

class Consumer implements Runnable
{
    private Resource res;
    
    Consumer(Resource res)
    {
        this.res =  res;
    }
    public void run()
    {
        while(true)
            res.out();
    }
}