title: get field list from json object list with Jackson
body: <p>I have JSON data that is getting from api, I want to get list of a field inside of json data.</p>
  
  <p>JSON data : </p>
  
  <pre><code>    [  
         {  
            "code":"en",
            "native":true,
            "plurals":{  
               "length":2,
               "forms":[  
                  "one",
                  "other"
               ]
            }
         }, {  
            "code":"de",
            "native":true,
            "plurals":{  
               "length":2,
               "forms":[  
                  "one",
                  "other"
               ]
            }
         }, {  
            "code":"le",
            "native":true,
            "plurals":{  
               "length":2,
               "forms":[  
                  "one",
                  "other"
               ]
            }
         }
  ]
  </code></pre>
  
  <p>I want to get code fields data as <code>list&lt;String&gt;</code> like below :</p>
  
  <pre><code>["en","de","le"]
  </code></pre>
  
  <p>what is the easiest way to do this?</p>
  
  <p>Note :  I am using Spring's RestTemplate to get data.</p>