The JSON is a lightweight, text-based and language-independent data exchange format. The JSON can represent two structured types like objects and arrays. A JSONArray can parse text from a String to produce a vector-like object. We can parse a nested JSON object using the getString(index) method of JSONArray. This is a convenience method for the getJSONString(index).getString() method and it returns a string value at the specified position.
String getString(int index)
import java.util.*;
import org.json.*;
public class NestedJSONObjectTest {
public static void main(String args[]) {
String jsonDataString = "{userInfo : [{username:abc123}, {username:xyz123},{username:pqr123}, {username:mno123},{username:jkl123}]}";
JSONObject jsonObject = new JSONObject(jsonDataString);
List<String> list = new ArrayList<String>();
JSONArray jsonArray = jsonObject.getJSONArray("userInfo");
for(int i = 0 ; i < jsonArray.length(); i++) {
list.add(jsonArray.getJSONObject(i).getString("username"));
System.out.println(jsonArray.getJSONObject(i).getString("username")); // display usernames
}
}
}abc123 xyz123 pqr123 mno123 jkl123
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