Open the door small example to learn ten use case diagrams

One 、 Background introduction

At work in the morning, Mr. Mi needs Mr. He to open the door of Shui Qilin

Premise ： Mr. MI and Mr. He belong to a large enterprise , Have good responsibility assignment and system management

Two 、 Ideas & programme

Disassemble the requirements into use case diagrams in an object-oriented manner

3、 ... and 、 The process

Four 、 summary

1. High cost in real life , Low cost in code
for example ： Real life replication N Share cost expansion N times , Expand in code N Cost is 1 times
2. Natural expansion in real life , It is easy to write in code
for example ： Containers in real life are naturally extensible ( A house is equipped with 1 Individual and 10 Anyone can ), We write code new A person is a person , Again new More than one is not supported

5、 ... and 、 sublimation

The road of programming is a process of imagination and creation