这就是我想要做的：
拥有一个频道名称列表，其中每个频道名称都有多个成员。两者都是字符串。
我现在正在做的是有一个 2d ArrayList。每个 ArrayList 上的第一个值是通道名称，下一个是其成员。有没有更好的方法来做到这一点（无需创建类）？
一个 Map 的一个键可以有多个值吗？这样我就有一个通道作为键，成员作为该键的值？
谢谢 ！
This is what I am trying to do :
Having a list of channel names where each channel name has several members. Both are Strings.
What I am doing now is having a 2d ArrayList.First value on each ArrayList is the channel name and next are its members. Is there a better way to do this (without creating classes) ?
Can a Map have many values for one key ? So that I have a channel as Key and members as Values to that Key ?
Thanks !
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是的，Java
Map可以有任何类型的键或值。这里您可能想要的是
Map> （因为我假设一个通道不能两次拥有相同的成员，对吧？）。任何确实意味着任何：您甚至可以将
Map作为Map的键。Yes, a Java
Mapcan have any types of keys or values.What you probably want here is a
Map<String, Set<String>>(since I assume a channel cannot have the same member twice, right?).And any really means any: you may even have
Maps as keys toMaps.Guava 的 Multimap 可以对你有帮助。
Guava's Multimap can be helpful for you.
您可以有一个
MapYou can have a
Map<String,ArrayList>我建议
Map> 其中T是通道成员类型。I suggest
Map<String, List<T>>whereTis the channel member type.