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UML常见的关系及使用Mermaid绘制UML类图 - 数据空间


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UML常见的类间关系及使用Mermaid绘制UML类图语法

泛化(Generalization)

继承关系,子类与父类的关系。

classDiagram
    Parent <|-- Children
    Parent : +int id
classDiagram Parent <|-- Children Parent : +int id
classDiagram
    Animal <|-- Duck
    Animal <|-- Fish
    Animal <|-- Zebra
    Animal : +int age
    Animal : +String gender
    Animal: +isMammal()
    Animal: +mate()
    class Duck{
      +String beakColor
      +swim()
      +quack()
    }
    class Fish{
      -int sizeInFeet
      -canEat()
    }
    class Zebra{
      +bool is_wild
      +run()
    }
classDiagram Animal <|-- Duck Animal <|-- Fish Animal <|-- Zebra Animal : +int age Animal : +String gender Animal: +isMammal() Animal: +mate() class Duck{ +String beakColor +swim() +quack() } class Fish{ -int sizeInFeet -canEat() } class Zebra{ +bool is_wild +run() }

实现(Realization)

类与接口的关系。

classDiagram
   class IFlyable{
     <<interface>>  
     +flying()
   }

   IFlyable <|..Bat
   Bat: +flying()
classDiagram class IFlyable{ <<interface>> +flying() } IFlyable <|..Bat Bat: +flying()

组合(Composition)

整体与部分的关系,部分不能离开整体单独存在。

classDiagram
  Computer *-- CPU
  Computer *-- Mainboard
  Computer *-- HardDisk
  Computer *-- MemeryCard
classDiagram Computer *-- CPU Computer *-- Mainboard Computer *-- HardDisk Computer *-- MemeryCard

聚合(Aggregation)

整体与部分的关系,部分可以离开整体单独存在。

classDiagram
  Company o-- Empolyee
classDiagram Company o-- Empolyee

关联(Association)

一种拥有关系,一个类知道另一个类的属性和方法。

classDiagram
  Reader "1..*" -- "1..*" Book
  Book "1..*"--> "1"Author
classDiagram Reader "1..*" -- "1..*" Book Book "1..*"--> "1"Author

依赖(Dependency)

一种使用关系,一个类的实现需要另一个类的协助。

classDiagram
  Animal..>Food
classDiagram Animal..>Food

泛化=实现>组合>聚合>关联>依赖

classDiagram
classA --|> classB : Generalization
classM ..|> classN : Realization
classC --* classD : Composition
classE --o classF : Aggregation
classG --> classH : Association
classI -- classJ : Association
classK ..> classL : Dependency
classDiagram classA --|> classB : Generalization classM ..|> classN : Realization classC --* classD : Composition classE --o classF : Aggregation classG --> classH : Association classI -- classJ : Association classK ..> classL : Dependency

标签: UML, Mermaid类图语法

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