JAVA 线程间通信

/*
	多线程编程 生产者和消费者
*/

class Res
{
	private int count=0;
	private String name;

	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() + "--生产者--" + this.name);
		
		flag = true;
		this.notifyAll();
	}

	public synchronized void out()
	{
		while(!flag)
			try{this.wait();}catch(Exception e){}

		System.out.println(Thread.currentThread().getName() + "--消费者----" + this.name);

		flag = false;
		this.notifyAll();//唤醒所有的等待线程
	}
	
}

class Producer implements Runnable
{
	Res r = new Res();

	Producer(Res r)
	{
		this.r = r;
	}
		
	public void run()
	{
		while(true)
			r.set("商品");
	}
}


class Consumer implements Runnable
{
	Res r = new Res();

	Consumer(Res r)
	{
		this.r = r;
	}
	
	public void run()
	{
		while(true)
			r.out();
	}

}

class TestDemo
{
	public static void main(String []args)
	{
		Res r = new Res();

		Producer p = new Producer(r);
		Consumer c = new Consumer(r);

		Thread t1 = new Thread(p);
		Thread t2 = new Thread(c);
		Thread t3 = new Thread(p);
		Thread t4 = new Thread(c);


		t1.start();
		t2.start();
		t3.start();
		t4.start();
	}
}