英文:
How to declare UML class diagram scanner scan declaration?
问题
你好，在 UML 类图中声明 Scanner 的适当方式是这样的：
+scan: Scanner 或者 +scan: Scanner(System.in)，或者其他方式。此外，还有其他需要添加的内容吗？哦，是的，我正在表示 Java。
谢谢
英文:
Hi what is the proper way to declare a scanner on a uml class diagram, like this
+scan: Scanner or +scan: Scanner(System.in) or something else. Also anything else I should add? Oh yeah I'm representing java.
Thanks
答案1
得分: 4
如果我理解正确，scan 是一个类的属性，Scanner(System.in) 是你初始化它的方式（默认值）
如在 formal/2017-12-05 第 9.5.4 节第 113 页所指定的那样：
[<visibility>] [‘/’] <name> [‘:’ <prop-type>] [‘[‘ <multiplicity-range> ‘]’]
[‘=’ <default>] [‘{‘ <prop-modifier > [‘,’ <prop-modifier >]* ’}’]
首先要注意的是可见性，‘+’ 表示 public，你确定你要将属性设置为 public 吗？这是危险的，因为这意味着它可以从任何其他类进行修改。
除此之外，如果你只想指示其可见性和类型：+scan : Scanner
如果你还想指示其默认值：+scan : Scanner = Scanner(System.in)
因此，+scan: Scanner(System.in) 是错误的。
英文:
If I well understand scan is an attribute of a class and Scanner(System.in) the way you initialize it (default value)
As specified in the formal/2017-12-05 §9.5.4 from page 113 the notation is :
[<visibility>] [‘/’] <name> [‘:’ <prop-type>] [‘[‘ <multiplicity-range> ‘]’]
[‘=’ <default>] [‘{‘ <prop-modifier > [‘,’ <prop-modifier >]* ’}’]
A first remark concern the visibility, '+' means public, are you sure you want your attribute public ? This is dangerous because that means it can be modified from any other class.
Out of that if you want to only indicate its visibility and type : +scan : Scanner
If you want to also indicate its default value : +scan : Scanner = Scanner(System.in)
So +scan: Scanner(System.in) is wrong
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