public synchronized void productBeer(){
        while(true){
            if(wb.bottlenumber==0)
            try {
                this.wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        wb.bottlenumber--;
        beernumber++;
        System.out.println("生产了"+beernumber+"瓶啤酒!");
        }
    }

    public static void main(String[] args) {
        Winebottle wb = new Winebottle();
        ProduceBeer pb = new ProduceBeer(wb);
        new Thread(wb).start();
        new Thread(pb).start();
    }