如何总结Java Hashmap的值 [英] How to sum values from Java Hashmap

问题描述

我需要一些帮助，我自己学习如何处理地图在Java ando今天，我试图获得的值从Hashmap的总和，但现在Im卡住。

I need some help, I'm learning by myself how to deal with maps in Java ando today i was trying to get the sum of the values from a Hashmap but now Im stuck.

这是我想要求和的映射值。

This are the map values that I want to sum.

HashMap<String, Float> map = new HashMap<String, Float>();

map.put("First Val", (float) 33.0);
map.put("Second Val", (float) 24.0);

<

Ass an additional question, what if I have 10 or 20 values in a map, how can I sum all of them, do I need to make a "for"?

感谢您的帮助。

推荐答案

如果您需要在地图中添加全部值，请尝试：

If you need to add all the values in a Map, try this:

float sum = 0.0f;
for (float f : map.values()) {
    sum += f;
}

最后， sum 变量将包含答案。所以是的，对于遍历 Map 的值，最好使用 for 循环。

At the end, the sum variable will contain the answer. So yes, for traversing a Map's values it's best to use a for loop.

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