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                            ## UML：Unified Modeling Language 統一建模語言
#### 畫圖工具：
* MS Office visio
* https://www.processon.com/

![](https://img.kancloud.cn/6c/6a/6c6a7a18b18dc021863998c869a14e6e_767x477.png)


## UML類圖之間的關系
* 泛化，表示繼承（空心箭頭，由子類指向父類）
* 關聯，表示引用（實心箭頭，指向被引用的類）
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