用 Java 实现一对多映射
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Implementing a one to many map in Java
提问by algorithmicCoder
Have one objectof type Athat is related to a bunch of objectsof type Band want to store all objectsof type Aand easily access their type Brelations.
有一个object的type A被涉及到一堆objects的type B，想存储所有objects的type A地访问他们的type B关系。
What's the best (built-in?) data structure doing this in Java?
在 Java 中执行此操作的最佳（内置？）数据结构是什么？
回答by Zach L
You could have a Mapof type Aobjects to a Listor Set(or whichever Collectionworks best) of type Bobjects, like:
你可以有一个地图的type A对象添加到列表或组（或任何类别的最好）的type B对象，如：
Map<A,List<B>> map = new HashMap<A,List<B>>();
Or use Google's MultiMapinterface, which will do essentially the same as above, but with less work on your part.
或者使用 Google 的MultiMap界面，它的作用与上述基本相同，但您的工作较少。
