线程间通信之生产者消费者问题



问题：

生产者(Productor)将产品交给店员(Clerk)，而消费者(Customer)从店员处取走产品，店员一次只能持有固定数量的产品(比如:20），如果生产者试图生产更多的产品，店员会叫生产者停一下，如果店中有空位放产品了再通知生产者继续生产；如果店中没有产品了，店员会告诉消费者等一下，如果店中有产品了再通知消费者来取走产品

class Clerk{
	int product;
	
	public synchronized void addProduct(){
		
		if(product < 20){
			product++;
			System.out.println(Thread.currentThread().getName()+"生产了第"+product+"个产品");
			notifyAll();
		}else{
			try {
				wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}
	
	public synchronized void consumeProduct(){
		if(product > 0){
			System.out.println(Thread.currentThread().getName()+"消费了第"+product+"个产品===============");
			product--;
			notifyAll();
		}else{
			try {
				wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}

class Producter implements Runnable{
    
	Clerk clerk;
	
	public Producter(Clerk clerk){
		this.clerk = clerk;
	}
	 
	@Override
	public void run() {
		while(true){
			try {
				Thread.currentThread().sleep(10);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			clerk.addProduct();
		}
	}
	
}

class Consumer implements Runnable{

	Clerk clerk;
	
	public Consumer(Clerk clerk){
		this.clerk = clerk;
	}
	@Override
	public void run() {
		while(true){
			clerk.consumeProduct();
		}
	}
	
}


public class TestThread {
	/**
	 * 
	 * @Title: main
	 * @Description:
	 * @param：
	 * @return void 
	 * @user： wangzg
	 * @Date：2014-10-20
	 * @throws
	 */
	public static void main(String[] args) {
		Clerk clerk = new Clerk();
	    
	    Producter p = new Producter(clerk);
	    Consumer  c = new Consumer(clerk);

	    Thread t1 = new Thread(p,"Producter One");
	    Thread t3 = new Thread(p,"Producter Two");
	    Thread t2 = new Thread(c,"Consumer One");
	    
	    t1.start();
	    t2.start();
	    t3.start();
	}

}