delegation的兄弟姐妹

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Publish Date:   2022-06-14

Delegation分为

*Use(A use B)

*Association(A has B)

*Composition/aggregation(A owns B)

dependencyt

通过方法的参数传递建立联系，进行调用

association

class中有固有的field,可以是外界传入的参数，也可以使用自带的参数

composition

association加强版，不可以外界传入，只能用自己的field

aggregation

可以在过程中更改方法中参数值，更灵活

Author: John Doe
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