Java HashMap关联多维数组无法创建或添加元素

Question

好了,所以我花了几个小时试图环绕在Java中一个HashMap的概念我的头,但我只是无法弄清楚.我看了很多教程,但似乎都没有解决我的确切要求,我无法让它工作.

我试图用Java(或类似的东西)创建一个关联的多维数组,这样我就可以使用字符串键保存到数组并从数组中检索.

这就是我在PHP中的表现,并且最好地解释了我要做的事情:

//loop one - assign the names
myArray['en']['name'] = "english name";
myArray['fr']['name'] = "french name";
myArray['es']['name'] = "spanish name";

//loop two - assign the description
myArray['en']['desc'] = "english description";
myArray['fr']['desc'] = "french description";
myArray['es']['desc'] = "spanish description";

//loop three - assign the keywords
myArray['en']['keys'] = "english keywords";
myArray['fr']['keys'] = "french keywords";
myArray['es']['keys'] = "spanish keywords";

//later on in the code be able to retrive any value similar to this
english_name = myArray['en']['name'];
french_name = myArray['fr']['name'];
spanish_name = myArray['es']['name'];

这是我在Java中尝试但它无法正常工作:

HashMap<String, HashMap<String, String>> myArray = new HashMap<String, HashMap<String, String>>();

myArray.put("en" , put("name", "english name")); //gives me "cannot find symbol" at second put

myArray.put("en" , ("name", "english name")); //gives me "')' expected" after second comma

因此,我确信它很简单,但我请注意,因为这非常令人沮丧!

谢谢

编辑:

所以这里有一些关于我如何实现我接受的答案的工作代码:

import java.util.*;

HashMap<String, HashMap<String, String>> finalArray = new HashMap<String, HashMap<String, String>>();

String[] langArray = {"en","fr","de","no","es"};

//Initialize each language key ahead of time
for(String lang : langArray) { // foreach lang in langArray
  if (!finalArray.containsKey(lang)) {
    finalArray.put(lang, new HashMap<String, String>());
  }
}

//loop one - assign names
for(String lang : langArray) {
  String theName = lang + " name"; //go get the name from somewhere
  finalArray.get(lang).put("name", theName);
}

//loop two - assign description
for(String lang : langArray) {
  String theDesc = lang + " description"; //go get the description from somewhere
  finalArray.get(lang).put("desc", theDesc);
}

//loop three - assign keywords
for(String lang : langArray) {
  String theKeys = lang + " keywords"; //go get the keywords from somewhere
  finalArray.get(lang).put("keys", theKeys);
}

//display output
for(String lang : langArray) {
  System.out.println("LANGUAGE: " + lang);
  System.out.println(finalArray.get(lang).get("name"));
  System.out.println(finalArray.get(lang).get("desc"));
  System.out.println(finalArray.get(lang).get("keys"));
}

//example to retrieve/get values
String english_name = finalArray.get("en").get("name");
String french_desc = finalArray.get("fr").get("desc");

Answer 1

HashMap<String, HashMap<String, String>> myArray = new HashMap<String, HashMap<String, String>>();

if (!myArray.containsKey("en")) {
    myArray.put("en", new HashMap<String, String>());
}
myArray.get("en").put("name", "english name");

在Java中,您必须明确何时创建对象.在这种情况下,首先我们检查HashMap在我们的外部是否已经存在一个对象存储在HashMap键"en"下面.如果没有,我们创建一个空的.

现在要为它添加一个新值,我们必须首先从外部获取它HashMap,然后放入新值.