Java中的双向地图？ | Java中的双向地图

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问题描述

我在Java中有一个简单的整数到字符串映射，但是我需要能够轻松地从整数获取字符串，也可以从字符串中整数。我已经尝试过Map，但是它只能从整数中检索字符串，这是一种方式：

  private static final Map< Integer，串GT; myMap = new HashMap< Integer，String>（）; 
 //这样做有一个方法：
 String myString = myMap.get（myInteger）; 
 
 //我需要像
 Integer myInteger = myMap.getKey（myString）;

有没有正确的方法来做到这两个方向？另一个问题是我只有几个不变的常量值（ 1->low，2-> mid，3->high，所以不值得去寻找一个复杂的解决方案。

解决方案

您可以使用Google Collections API，最近重命名为，特别是

I have a simple integer-to-string mapping in Java, but I need to be able to easily retrieve string from integer, and also integer from string. I've tried Map, but it can retrieve only string from integer, it's one way:

private static final Map<Integer, String> myMap = new HashMap<Integer, String>();
// This works one way:
String myString = myMap.get(myInteger);

// I would need something like:
Integer myInteger = myMap.getKey(myString);

Is there a right way to do it to have it both directions?

Another problem is that I only have a few constant values that don't change (1->"low", 2->"mid", 3->"high", so it wouldn't be worth to go for a complicated solution.

解决方案

You can use the Google Collections API for that, recently renamed to Guava, specifically a BiMap

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