Java：获取hashmap值 [英] Java: Get hashmap value

问题描述

我一直在查看互联网，但我似乎找不到这个答案。我有一个HashMap：

  public Map< String，Integer> killstreaks = new HashMap< String，Integer>（）; 
  

现在我想调用第二个值，整数。因此，通过使用字符串作为参考，我知道我可以做到这一点：

  killstreaks.get（// idk）
  

我只需要知道如何获得第二个值，以便我可以使用它来使用公式来计算奖励玩家的价值。

它的工作原理是玩家杀死一个人，然后我将它存储在这个玩家的名字和他们所在的连胜中，因为他们杀了我给连胜加1 。当他们杀了一个人，我想给他们钱，根据他们的条纹，所以我想用整数相比名称，所以如果我提供的名称，它给出了相应的int，我怎么得到的？感谢！

解决方案

这是您可以遍历 Map ：
$ （Map.Entry< String，Integer>条目：killstreaks.entrySet（））{
String key = entry.getKey（）; b $ b

  
整数值= entry.getValue（）; 
 //在这里继续
} 
  

获取特定值（ killstreak.get（ yourKey）;


从您的评论看来，您希望将条目增加1，您可以使用：

  killstreaks.put（key，killstreaks.get（key）+ 1）; 
  

正如我看到您使用的是Java 8，您甚至可以使用更好的 getOrDefault ：
$ b

  killstreaks.put（key，killstreaks.getOrDefault（key，0）+ 1）; 
  

I've been looking over the internet but I cant seem to find this answer. I have a hashmap:

public Map<String, Integer> killstreaks = new HashMap<String, Integer>();

Now I want to call the second value, the integer. SO by using the string as a reference, I know I can do this:

killstreaks.get(//idk)

I just need to get my head around on how to get the second value so I can use it to use a formula to work out a value to reward the player.

How it works is that the player kills someone and I store it in this, the player name and the streak they are on, as they kill I add 1 to the streak. When they kill someone I want to give them money according to their streak so I want to use the integer compared to the name, so if I provide the name, it gives the corresponding int, how do I get that? Thanks!

解决方案

This is how you can iterate over your Map:

for (Map.Entry<String, Integer> entry : killstreaks.entrySet()) {
    String key = entry.getKey();
    Integer value = entry.getValue();
    // continue here
}

To get a specific value (Integer) from your Map use:

killstreak.get("yourKey");

Seeing from your comment that you want to increment entries by 1, you can use:

killstreaks.put(key, killstreaks.get(key) + 1);

And as I see you are using Java 8 you can even use the nicer getOrDefault:

killstreaks.put(key, killstreaks.getOrDefault(key, 0) + 1);

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