java线程同步Demo1

public class Bread
{
    private int number = 6;
    public synchronized void push()
    {
        number++;
        System.out.println("生产一个面包，剩余 ：" + number);
    }
    public void pop()
    {
        number--;
        System.out.println("消费一个面包，剩余 ：" + number);
    }
    public int hasNumbers()
    {
        return this.number;
    }
}