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graph TD
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A --> B
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A --> C
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B --> D
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C --> D

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sequenceDiagram
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    participant Alice
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    participant Bob
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    Alice->>John: Hello John, how are you?
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    loop Healthcheck
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        John->>John: Fight against hypochondria
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    end
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    Note right of John: Rational thoughts <br/>prevail!
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    John-->>Alice: Great!
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    John->>Bob: How about you?
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    Bob-->>John: Jolly good!

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gantt
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dateFormat YYYY-MM-DD
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title Demo
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excludes weekdays 2014-10-20
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section Task
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Now task:done,des1,2014-10-20,2014-10-25
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Active Task:active,desc2,2014-10-25,5d
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Future Task:desc3,after desc2,5d
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Future Task:desc4,after desc3,5d

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classDiagram
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class FactoryPatternDemo{
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  +main()void
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}
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class Shape{
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  <<interface>>
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  +draw()void
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}
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class Circle{
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  <<interface>>
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  +draw()void
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}
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class Square{
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  <<interface>>
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  +draw()void
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}
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class Reactangle{
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  <<interface>>
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  +draw()void
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}
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FactoryPatternDemo-->ShapeFactory:使用工厂
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ShapeFactory --|> Shape:创建工厂
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Circle --|> Shape:implements
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Square --|> Shape:implements
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Reactangle --|> Shape:implements