Java - 获取HashMap中的键索引? [英] Java - get index of key in HashMap?

问题描述

在 java 中，如果我在 HashMap 的 keySet() 上循环，我如何(在循环内)获取该键的数字索引?

In java if I am looping over the keySet() of a HashMap, how do I (inside the loop), get the numerical index of that key?

基本上，当我遍历地图时，我希望能够获得 0,1,2...我认为这比声明一个 int 并在每次迭代中递增更清晰.

Basically, as I loop through the map, I want to be able to get 0,1,2...I figure this would be cleaner than declaring an int and incrementing with each iteration.

谢谢.

推荐答案

使用 LinkedHashMap 代替 HashMap调用 keySet() 时，它总是以相同的顺序(与插入)返回键

Use LinkedHashMap instead of HashMap It will always return keys in same order (as insertion) when calling keySet()

有关详细信息，请参阅 类 LinkedHashMap

For more detail, see Class LinkedHashMap

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