Class

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()
    }

Syntax

• class Name { … } lists members; +, -, # and ~ set visibility, and () makes a method.
• Name : +member adds one member outside the block.
• <|-- is inheritance, *-- composition, o-- aggregation, --> association, ..> dependency, ..|> realization.
• : text after a relation labels it; quoted cardinalities sit at either end.
• namespace Name { … } groups classes; note and note for Name add notes.