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Update lab7.md
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yinghaocai committed Apr 10, 2020
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- 订单。(理由:取消航班之后会出现订单的相关业务,对应订单状态的变化。)

2.2 确定对象的所有重要状态:
- 新建的、暂存的、在辑的、确认的和预取消的航班。
- 新建的、在辑的、暂存的、已提交的、未付款的、付款的、预取消的和未退款的订单。

- 售票中的、在途中的、到达的和取消的航班。
- 待付款的、已付款的、已出票的、待取消的和已退款的订单。

2.3 确定对象的状态之间的关键转换条件:
- 暂存的和在辑的航班通过点击确认按钮,将转变为确认的;确认的航班通过取消操作,将转变为预取消的。
- 付款的订单触发退款业务后,转变为未退款的。
- 售票中的航班转换为取消的航班是通过管理员取消航班。
- 已出售的订票为待取消的是通过管理员取消航班;待取消的订单转换为已退票的是通过触发退款业务。

## 四、实验结果

#### 1. 航班状态图
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