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# 实验七 状态建模 | ||
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## 一、实验目标 | ||
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1. 理解何为对象的状态; | ||
2. 掌握状态建模方法; | ||
3. 掌握状态图的画法(Statechart Diagram)。 | ||
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## 二、实验内容 | ||
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1. 学习对象的状态的概念; | ||
2. 学习状态图的画法; | ||
3. 找出自己系统中的一个关键对象,绘制该对象的状态图。 | ||
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## 三、实验步骤 | ||
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1. 从本系统中找出一个关键的对象,为口罩 | ||
2. 设置新闻的状态,为未购买的、已购买的、退货的 | ||
3. 设置这三种状态转变的条件 | ||
4. 完成该状态图 | ||
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## 四、实验结果 | ||
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 | ||
图一.口罩的状态图 | ||
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