[Apex/JSON] JSON型文字列を配列にする/Change JSON Type to Array

<問題・Problem>

JSON型の文字列をApex ClassでList型やMap型に変換したい！
JSON type String needs to be changed to List type or Map type in Apex Class!

<解決策・Solution>

JSON.deserializeとキャストを使用します。
Use JSON.deserialize and Cast.

Listの場合/List case:
List<String> リスト名/List Name = (List<String>)JSON.deserialize(JSON文字列/JSON String , List<String>.class);

<サンプル・Sample>

JSON:

 [  
   {"name":"pen","num":"10"},  
   {"name":"pineapple","num":"20"},  
   {"name":"apple","num":"30"}  
 ]  

Apex Class:

 String jsonString = '[{"name":"pen","num":"10"},{"name":"pineapple","num":"20"},{"name":"apple","num":"30"}]';  
   
 List<map<String,String>> sampleList = (List<Map<String,String>>)JSON.deserialize(jsonString,List<Map<String,String>>.class);  
 
 for(Integer i = 0;i<sampleList.size();i++){  
   for(String s : sampleList[i].keySet()){  
     system.debug(s + ' : ' + sampleList[i].get(s));  
   }  
 }  

Debug Result:

 pen : 10  
 pineapple : 20  
 apple : 30