| 爱心新闻：
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| 软件名称： |
uml tutorial |
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| 软件语言： |
简体中文 |
| 软件类型： |
未知 / 授权未知 / uml |
| 运行环境： |
Win9x/NT/2000/XP/ |
| 软件大小： |
322k |
| 软件等级： |
 |
| 整理时间： |
2005-8-5 3:06:15 |
| 演 示： |
http://www.51dibs.com |
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| 软件简介: |
uml tutorial
UML Use Case Diagrams
Engineering Notebook
C++ Report
Nov-Dec 98
An important part of the Unified Modeling Language (UML) is the facilities for drawing use case
diagrams. Use cases are used during the analysis phase of a project to identify and partition system
functionality. They separate the system into actors and use cases.
Actors represent roles that can are played by users of the system. Those users can be humans, other
computers, pieces of hardware, or even other software systems. The only criterion is that they must be
external to the part of the system being partitioned into use cases. They must supply stimuli to that part of
the system, and the must receive outputs from it.
Use cases describe the behavior of the system when one of these actors sends one particular stimulus. This
behavior is described textually. It describes the nature of the stimulus that triggers the use case; the inputs
from and outputs to other actors, and the behaviors that convert the inputs to the outputs. The text of the
use case also usually describes everything that can go wrong during the course of the specified behavior,
and what remedial action the system will take.
For example, consider a point of sale system. One of the actors is the customer and another is the sales
clerk. Here is just one use case from this system:
Use Case 1: Sales Clerk checks out an item
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最近更新 |
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http 点这里下载-> uml tutorial