How to Extract Interest Keys from a JSON Object in Java?

Retrieving Interest Keys from a JSON Object in Java

As outlined in your query, you aim to parse a JSON object containing a list of interests into an arraylist in Java. Here's a step-by-step guide to achieve this using the org.json library:

1. Import the org.json Library:

import org.json.JSONObject;
import org.json.JSONArray;

2. Create an instance of JSONObject:

JSONObject obj = new JSONObject("{interests : [{interestKey:Dogs}, {interestKey:Cats}]}");

3. Create an ArrayList for Interest Keys:

List<String> list = new ArrayList<String>();

4. Extract the "interests" Array:

JSONArray array = obj.getJSONArray("interests");

5. Iterate Through the Array and Extract Interest Keys:

for (int i = 0; i < array.length(); i++) {
    list.add(array.getJSONObject(i).getString("interestKey"));
}

Result:

The resulting ArrayList, list, will contain all the interest keys in the original JSON object.

The above is the detailed content of How to Extract Interest Keys from a JSON Object in Java?. For more information, please follow other related articles on the PHP Chinese website!