java线程同步Demo3

public class Consumer extends Thread
{
    private Bread bread;
    public Consumer(Bread bread)
    {
        this.bread = bread;
        this.start();
    }
    public void run()
    {
        for (int i = 0; i < 5; i++)
        {
            // 把hasNumbers和pop方法放在一个同步块中，保证同时只有一个线程执行
            synchronized(bread) // 执行完后即释放对象锁
            {
                int number = bread.hasNumbers();
                System.out.println("当前剩余面包个数：" + number);
                if (number > 0)
                {
                    bread.pop();
                    try
                    {
                        sleep(500); // 休眠让其他线程有机会执行
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}