association是什么意思？用法、例句 英语单词Association, Aggregation, Composition的区别

大家好，关于association是什么意思？用法、例句很多朋友都还不太明白，今天小编就来为大家分享关于英语单词Association, Aggregation, Composition的区别的知识，希望对各位有所帮助！

1、Associationisarelationshipbetweentwoobjects,buttherelationshipbetweenthemcouldbemultipletypes.Itcouldbeone-to-one,one-to-many,many-to-one,many-to-many.Inotherwords,therelationshipisveryflexible(灵活的)andloose(松散的).

2、Insoftwareprogramming,anobjectmayusefunctionsprovidedbyanobjectofanotherclass,thiskindofrelationshipiscalledassociation.

3、AggregationandCompositionaresubsetsofassociation.

4、Aggregationisasubset(子集)ofassociation.Itdepicts(描述)adirectional(有方向的)associationbetweentwoobjects,whichmeansitisanassociationthatrepresents(代表)apart-wholeorpart-ofrelationship.Butthisrelationshipisnottoorestrictive,whichmeanstwoobjectscanexistwithouteachother.

5、Compositionisasubsetofaggregation.Thisrelationshipismostrestrictive(严苛的),whichmeansitrepresentsanownership(拥有)relationship.Thecontained(被包含的)objectcannotexistwithouttheexistence(存在)ofcontainer(容器、拥有者)object.

6、TherelationshipbetweenCaranditsEngineiscalledComposition.BecauseitsEnginecannotbeusedinanyothercar.

7、汽车与专属的发动机之间的关系是Composition。因为发动机离开汽车后，将没有单独存在的意义。

8、TherelationshipbetweenClassroomandStudentsiscalledAggregation.Becauseeachonecanstillexistwithouteachother.

9、教室与学生之间的关系是Aggregation。因为一个教室可以包含多个学生，并且两者都可以独立存在。(估计大家会觉得一个学生也可以在多个教室上课，所以不是Aggregation。这个确实不同的角度分析有不同的看法。但我个人更认为是Aggregation，因为学生不能包含教室)

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