Java.按值对地图排序

问题描述

我需要像TreeMap这样排序的地图，但是按值排序.我的地图很大，所以我不能随时随地对我的地图进行排序.是否存在解决此问题的良好解决方案?也许存在外部罐子遇到这个问题?

I need sorted map like TreeMap but sorted by value. My map will be huge, so i can't just sort my map anytime i need. Exist any good solution to resolve this problem? Maybe exist external jar who meets this?

推荐答案

有很多方法可以满足您的要求.正如您随后澄清的那样，您当前的 TreeMap 中可能有重复的对象，也许您可​​以用第三方多重地图(番石榴， Apache Commons Collections )，然后交换您的密钥和值-即用 Multimap< Value替换 TreeMap< Key，Value> 键> .根据您的具体情况，我相信这是为您工作的好机会.

There are a number of ways to satisfy your requirement. As you have subsequently clarified that you may have duplicate objects in your current TreeMap, perhaps you could replace your TreeMap with a third-party multimap (Guava, Apache Commons Collections), then swap your keys and values around - i.e. replace TreeMap<Key, Value> with Multimap<Value, Key>. Depending on the details of your situation I believe this stands a good chance of working for you.

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