我和我的同事在一点上无法达成一致。在 UML 中，进行聚合时，菱形边的重数是否为 1 最大值，或者可以为 0..* ？还是取决于观点？
先感谢您 ！
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首先，您需要具体说明您的意思是哪个“钻石”作为聚合中的空钻石和填充钻石是组合？
如果您的意思是空钻石，那么 Icepack 是正确的，并且您混淆了 2 个不同的东西。 多重性与聚合无关，因此“菱形”聚合指标可以具有您喜欢的任何多重性，因为它们是不相关的。
If you mean filled diamond ie composition then the example someone has posted won't really help you as it's saying: "There are many departments but only 1 University (multiplicity)" and that "if all departments are deleted then University is also deleted (composition)".
I am struggling to think of a good example where composition end wouldn't be 1 only and as far as I can think it would never be 0..* as you can have a class which has to delete something which may not ever exist? I could however be 1..* ie many to many, for example Exam and Exam Questions.
多重性可能是1..*即1..* 考试有1 or more问题并且问题可以存在于1 or more考试中。考试结束时填充菱形（作文）意味着如果所有问题都被删除，那么所有考试也将被删除
于 2013-09-26T15:38:12.297 回答
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是的，它可以是 0..*。这里有一个很好的例子：系有几个教授，每个教授可能同时属于几个系。
于 2012-12-18T15:24:03.707 回答