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stock
- 实现了股票销售者同时与多个顾客之间的信息通信,当一个对象(股票信息)改变状态时,所有依赖者(顾客)都会收到通知并自动更新-To achieve the stock sales were at the same time with multiple customers and information and communication, when an object (stock information) to change the state, all dependent persons (cu