UML - 序列图如何显示替代课程 [英] UML - Sequence Diagram how to show alternate course

问题描述

我有一个名为 logon(uname,pass) 的函数，它返回成功或失败消息.我应该将其显示为 ALT 片段吗?

I've a function called logon(uname,pass) which returns either success or failure message. Should i show this as ALT fragment?

基本上我是在将这个用例转换为序列图之后:

Basically I'm after transforming this use case to sequence diagram:

> main flow:
> 1. User provide username password.
> 2. Display successful message after logon.
> 
> alternate flow:
> 1. User provide invalid username and passsword.
> 2. Display invalid username or passwrod message.

谢谢

推荐答案

参见 这个例子.

话虽如此，我和@Tanparmaiel 一样更喜欢活动图作为替代方案:视觉上更直观.

Having said that, I'm with @Tanparmaiel in preferring an activity diagram for alternatives: much more visually intuitive.

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