将两个列表组合成地图(Java)的最佳方法是什么? [英] What is the best way to combine two lists into a map (Java)?

问题描述

使用 for (String item: list) 会很好，但它只会遍历一个列表，并且您需要一个显式迭代器用于另一个列表.或者，您可以对两者都使用显式迭代器.

It would be nice to use for (String item: list), but it will only iterate through one list, and you'd need an explicit iterator for the other list. Or, you could use an explicit iterator for both.

这是问题的一个示例，以及使用索引 for 循环代替的解决方案:

Here's an example of the problem, and a solution using an indexed for loop instead:

import java.util.*;
public class ListsToMap {
  static public void main(String[] args) {
    List<String> names = Arrays.asList("apple,orange,pear".split(","));
    List<String> things = Arrays.asList("123,456,789".split(","));
    Map<String,String> map = new LinkedHashMap<String,String>();  // ordered

    for (int i=0; i<names.size(); i++) {
      map.put(names.get(i), things.get(i));    // is there a clearer way?
    }

    System.out.println(map);
  }
}

输出:

{apple=123, orange=456, pear=789}

有更清楚的方法吗?也许在某个地方的集合 API 中?

Is there a clearer way? Maybe in the collections API somewhere?

推荐答案

由于键值关系是通过列表索引隐式的，我认为显式使用列表索引的 for-loop 解决方案实际上非常清晰 - 并且简短

Since the key-value relationship is implicit via the list index, I think the for-loop solution that uses the list index explicitly is actually quite clear - and short as well.

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