UNL class diagram

Zoo System

Animals are parents

Turtles , Otter , Lazy monkeys are a subclass of animals , Inheritance and animal class abstract class

Greep It's a kind of creeping turtle ,Greep It is a part of tortoise , So he and turtles are converging .

Sightseeing centers are due to Lobby（ auditorium ） and Bathroom（ Toilet ） form

A sightseeing center has only one auditorium , But at least there is one or more toilets

Let's take a practical example ：

 

  As shown in the figure, the user class consists of two subclasses —— Customer class , Manager class

Each customer has 0 One or more shopping carts , Each user has 0 One or more orders

Each order can only have one order information and order details

The above are all combinatorial relationships

See video for detailed explanation ：

UML Class diagram _ Bili, Bili _bilibili