title: How can I iterate through JSON objects using Jackson?
body: <p>I ultimately want to create inverted indexes using my JSON dataset. I know how to parse through one JSON object but how can I iterate through many? Here is what I have working: </p>
  
  <p>File1: </p>
  
  <pre><code>{
      "doc_id": "2324jos",
      "screen_name": "twitter_user101",
      "tweet_text": "Its a beautiful day to be productive",
      "hashtags": "[]",
      "links": "[]",
      "place_type": "city",
      "place_name": "Evergreen Park",
      "created_at": "2019-02-08 22:24:03"
  }
  </code></pre>
  
  <p>My code: </p>
  
  <pre><code>public class ParseJson {
      public static void main(String[] args) throws Exception {
          // this is the key object to convert JSON to Java
          Tweet tweet;
          ObjectMapper mapper = new ObjectMapper();
          try {
              File json = new File("test.json");
              tweet = mapper.readValue(json, Tweet.class);
              System.out.println("Java object created from JSON String :");
              System.out.println(tweet);
          } catch (IOException ex) {
              ex.printStackTrace();
          }
      }
  }
  
  public class Tweet {
      public String doc_id;
      public String screen_name;
      public String tweet_text;
      public String hashtags;
      public String links;
      public String place_type;
      public String place_name;
      public String created_at;
  
      public Tweet() {
  
      }
  
      public Tweet(String doc_id, String screen_name, String tweet_text, String hashtags, String links, String place_type, String place_name, String created_at) {
          this.doc_id = doc_id;
          this.screen_name = screen_name;
          this.tweet_text = tweet_text;
          this.hashtags = hashtags;
          this.links = links;
          this.place_name = place_name;
          this.place_type = place_type;
          this.created_at = created_at;
      }
  
      @Override
      public String toString() {
          return doc_id + screen_name + tweet_text;
      }
  }
  </code></pre>
  
  <p>Now, I want to iterate through this JSON file which has 2 JSON objects in an array: </p>
  
  <p>File2: </p>
  
  <pre><code>[
      {
          "doc_id": "2324jos",
          "screen_name": "b'LIBBYRULZ'",
          "tweet_text": "@ABC ya'll be lying",
          "hashtags": "[]",
          "links": "[]",
          "place_type": "city",
          "place_name": "Evergreen Park",
          "created_at": "2019-02-08 22:24:03"
      },
      {
          "doc_id": "8982hol",
          "screen_name": "b'eddylee_1'",
          "tweet_text": "Hungry for money",
          "hashtags": "[]",
          "links": "[]",
          "place_type": "city",
          "place_name": "Manhattan",
          "created_at": "2/7/2019 17:01"
      }
  ]     
  </code></pre>
  
  <p>How can I adjust my above code using Jackson to do so where the doc_id is the unique key? I want to be able to return all the data in each JSON object for each doc_id. </p>