显示双向和组合关系UML类图
[英]Display bidirectional and composition relation UML class diagram
问题描述
I have two classes Event and Review. 
我有两个活动和评论类。
The event has an instance object Review in it. 该事件中有一个实例对象Review。 A review also has an object Event in it. 评论中还包含对象事件。 This means a bidirectional relationship between them (two arrows). 这意味着它们之间存在双向关系（两个箭头）。
When an event is deleted the review will also be deleted. 删除活动后，评论也会被删除。 This means a composition relationship between them (filled diamond at Event). 这意味着它们之间的组成关系（事件中填充的菱形）。
Now my question is: How can I display the two arrows and the filled diamond together in the same line? 现在我的问题是：如何在同一行中同时显示两个箭头和填充的菱形？
I'm wondering if I should left out the directional relation when showing the composition or aggregation? 我想知道在显示合成或聚合时是否应该忽略方向关系？ With association the direction arrow(s) can be displayed with no problem, but having the diamond there is a problem... 有了关联，方向箭头就可以毫无问题地显示出来，但是有了菱形就出现了问题...
1 个解决方案
解决方案1
1 已采纳 2011-03-01 21:49:14
要回答这个问题的标题：可以使用双箭头（两端各一个）或根本不显示箭头来显示双向导航（由于关联是双向的，因此无需添加箭头）。
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