UML类图—继承的多重性
[英]UML Class Diagram — Multiplicity for Inheritance
问题描述
My understanding is that, in UML class diagrams, inheritance is a particular kind of association. 
我的理解是，在UML类图中，继承是一种特殊的关联。
An association can have a multiplicity. 关联可以具有多重性。
However, it seems that inheritance is never represented with a multiplicity. 但是，似乎继承永远不会用多重性来表示。
Why? 为什么？ Is it because the multiplicity is always 1..1 and 0..1 (example below)? 是因为多样性始终是1..1和0..1 （下面的示例）吗？
1 个解决方案
解决方案1
7 已采纳 2018-04-30 22:17:48
inheritance is a particular kind of association
This is a fundamental misunderstanding. 这是一个根本的误解。 Generalization (aka inheritance) is a particular kind of relationship but it is not an association . 泛化（即继承）是一种特殊的关系，但不是关联 。
Thus there is no multiplicity for it. 因此，没有多重性。 Also as already mentioned it would make no sense to have one. 同样正如已经提到的，拥有一个没有意义。
Generalization is on a class level. 泛化在类级别上。 If a class B is a specialized class of class A, then all elements that are of type B are at the same type also of type A. 如果类B是类A的专门类，则所有类型B的元素也都属于类型A。
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