对于Java HashMap上的每个循环 [英] For each loop on Java HashMap

问题描述

我写的一个基本的聊天程序有几个关键字，它们会产生特殊的动作，图像，消息等。我将所有关键字和特殊功能存储在HashMap中。关键词是关键和功能是价值。我想用某种类型的循环比较用户输入和键。我尝试了一切我能想到的，没有任何工作。这是我可以弄清楚的：

  myHashMap =<文件输入> 
 for（String currentKey：< HashMap Keys列表>）{
 if（user.getInput（）。equalsIgnoreCase（currentKey））{
 //相关的值操作
 } 
} 
 ... 
  

我将不胜感激。请原谅我，如果我忽略了类似的问题，或者答案是显而易见的。

好的，你可以这样写：

（字符串currentKey：myHashMap.keySet（））{

  
 
 
但这并不是使用哈希映射的最佳方式。
 
 
 
更好的方法是填充 myHashMap 全部使用小写键，然后写入： 
 
 
  theFunction = myHashMap。得到（user.getInput（）toLowerCase（））; 
  
检索函数（或 null  if用户输入不会出现在地图中）。
 
A basic chat program I wrote has several key words that generate special actions, images, messages, etc. I store all of the key words and special functions in a HashMap. Key words are the keys and functions are the values. I want to compare user input to the keys with some type of loop. I have tried everything I can think of and nothing works. This is what I can figure out:
myHashMap = <File Input>
for(String currentKey : <List of HashMap Keys>){
    if(user.getInput().equalsIgnoreCase(currentKey)){
        //Do related Value action
    }
}
...
I would appreciate any help. Forgive me if I overlooked a similar question or if the answer is obvious.
解决方案
Well, you can write:
for(String currentKey : myHashMap.keySet()){
but this isn't really the best way to use a hash-map.

A better approach is to populate myHashMap with all-lowercase keys, and then write:
theFunction = myHashMap.get(user.getInput().toLowerCase());
to retrieve the function (or null if the user-input does not appear in the map).

                        
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