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UML (:pineapple:diagrams (:four:state diagram, :five:timing diagrams, …
UML
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:snowflake:principles
:one:relationships
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:three:Association
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:two:Composition
:bread:A has a 'a'
A
a
:star:可以在菱形和箭头旁边写数字,表示对应的数量关系
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