线程协作,producer and consumer.

from:http://www.java-samples.com/showtutorial.php?tutorialid=306

//Q.java 代表队列，存数据



package com.test.threadcooperate;



//A correct implementation of a producer and consumer. 

public class Q {

	int n;

	volatile boolean valueSet = false;



	public synchronized int get() {

		if (!valueSet)

			try {

				wait(); // 无限等待

				// wait(4000); //每过4秒继续执行一次

			} catch (InterruptedException e) {

				System.out.println("InterruptedException caught");

			}

		System.out.println(Thread.currentThread() + ",ThreadID:"

				+ Thread.currentThread().getId() + " Got: " + n);

		valueSet = false;

		notifyAll();

		return n;

	}



	synchronized void put(int n) {

		if (valueSet)

			try {

				wait();

			} catch (InterruptedException e) {

				System.out.println("InterruptedException caught");

			}

		this.n = n;

		valueSet = true;

		System.out.println("Put: " + n);

		notifyAll();

	}

}



//producer.java

package com.test.threadcooperate;



public class Producer implements Runnable {

	Q q;



	Producer(Q q) {

		this.q = q;

		new Thread(this, "Producer").start();

	}



	public void run() {

		int i = 0;

//		while (true) {

//			q.put(i++);

//		}

		for(;i<100;) {

			q.put(i++);

		}

		q.put(-1);	//用于退出，状态标志

	}

}



//consumer.java





package com.test.threadcooperate;





public class Consumer implements Runnable {

	Q q;



	Consumer(Q q) {

		this.q = q;

		new Thread(this, "Consumer").start();

	}



	public void run() {

		while (true) {

			 int result= q.get();

			 if(result==-1)break;

		}

	}

}



//PCFixed.java



package com.test.threadcooperate;



public class PCFixed {



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		Q q = new Q();

		new Producer(q);

		new Consumer(q);	//消费者1

//		new Consumer(q);	//消费者2,有两个消费者时有问题。

		System.out.println("Press Control-C to stop.");

	}

}