# Class

Classes with members, relationships, cardinality, and namespaces.

## Examples

The playground samples for this type, rendered by Ondine when the documentation builds.

### Example 1

```mermaid
---
config:
  class:
    hierarchicalNamespaces: false
---
classDiagram
    namespace Earth.Volcano.Summit {
        class Crater {
            +erupt()
        }
    }
    namespace Earth.Volcano.Slope {
        class LavaFlow {
            +buildLand()
        }
    }
    namespace Earth {
        class Hotspot {
            +meltRock()
        }
    }
    Hotspot --> Crater : feeds
    Hotspot --> LavaFlow : feeds

```

### Example 2

```mermaid
---
title: Reef animal example
---
classDiagram
    note "From Turtle till Whale"
    Animal <|-- Turtle
    note for Turtle "can swim<br>can dive<br>can nest on beaches<br>can live for decades"
    Animal <|-- Shark
    Animal <|-- Whale
    Animal : +int age
    Animal : +String name
    Animal: +isMammal()
    Animal: +migrate()
    class Turtle{
        +String shellColor
        +swim()
        +nest()
    }
    class Shark{
        -int sizeInFeet
        -canHunt()
    }
    class Whale{
        +bool is_humpback
        +sing()
    }

```

### Example 3

```mermaid
---
title: Animal example
---
classDiagram
    note "From Duck till Zebra"
    Animal <|-- Duck
    note for Duck "can fly<br>can swim<br>can dive<br>can help in debugging"
    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()
    }

```

### Example 4

```mermaid
---
config:
  theme: default
  look: classic
  layout: dagre
---
classDiagram
  class Customer {
    +String name
    +String email
  }
  class Order {
    +String id
    +Date placedAt
    +total() Money
  }
  class LineItem {
    +int quantity
  }
  class Payment {
    <<interface>>
    +authorize() bool
  }
  Customer "1" --> "*" Order : places
  Order "1" *-- "*" LineItem : contains
  Order --> Payment : settled by

```

### Example 5

```mermaid
classDiagram
    namespace Platform {
        namespace Auth {
            class UserService {
                +login()
                +logout()
            }
        }
        namespace Data {
            class Repository {
                +find()
                +save()
            }
        }
        class Gateway {
            +route()
        }
    }
    Gateway --> UserService : delegates
    Gateway --> Repository : delegates

```

### Example 6

```mermaid
---
config:
  class:
    hierarchicalNamespaces: false
---
classDiagram
    namespace Company.Engineering.Backend {
        class Developer {
            +writeCode()
        }
    }
    namespace Company.Engineering.Frontend {
        class Designer {
            +createMockup()
        }
    }
    namespace Company {
        class CEO {
            +makeDecisions()
        }
    }
    CEO --> Developer : oversees
    CEO --> Designer : oversees

```