ref:http://www.cnblogs.com/happyPawpaw/archive/2013/01/18/2865957.html
注释很清楚的，
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors; //产品
class Product
{
String name=null;
public Product(String name)
{
this.name=name;
} } class Buffer
{
private Queue<Product> queue=new LinkedList<Product>();//一个普通队列，同时作为同步的对象
private final int size=5; //最大长度为，可以自己调整
public void add(Product p)//
{
synchronized (queue) {
while(queue.size()==size)
{
System.out.println(Thread.currentThread().getName()+"队列已经满了，生产者释放锁");
try {
queue.wait(); //队列未满，则放弃锁，进行挂起，等到queue,notify，有个线程会重新从wait后运行
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
queue.offer(p); System.out.println(Thread.currentThread().getName()+"入队 "+queue.size()); queue.notify();//加入一个元素，则通因为为空而挂起的线程 } } public void remove()
{
synchronized (queue) {
while(queue.size()<=0)
{ System.out.println(Thread.currentThread().getName()+"队列为空，释放锁");
try {
queue.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
queue.poll();
System.out.println(Thread.currentThread().getName()+"出队，剩下"+queue.size());
queue.notify(); } } } class Producer implements Runnable
{
private Buffer buf; //所有线程共享一个buffer，所以作为参数 public Producer(Buffer buf)
{
this.buf=buf;
} @Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<10;i++)
{
try {
Thread.sleep(3000); //控制生产速度，可以让生产快，还是消费快，来观察队列的情况，
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buf.add(new Product("zhang "+i));
} } }
class Customer implements Runnable
{
private Buffer buf=null;
public Customer(Buffer buf)
{
this.buf=buf;
}
@Override
public void run() {
for(int i=0;i<10;i++)
{
try {
Thread.sleep(1);//控制生产速度，，
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//
buf.remove();
} } } public class 生产消费者 { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub //学学使用线程池
Buffer buf=new Buffer();
ExecutorService exe=Executors.newCachedThreadPool();//一个简单的线程池
int i=0;
while(i++<2)
{
exe.submit(new Producer(buf)); //生产者两个线程 }
i=0;
while(i++<2)
{
exe.submit(new Customer(buf));//消费者两个线程
}
exe.shutdown(); } }