Change

JSONObject objects = getArray.getJSONArray(i);

to

JSONObject objects = getArray.getJSONObject(i);

or to

JSONObject objects = getArray.optJSONObject(i);

depending on which JSON-to/from-Java library you're using. (It looks like getJSONObject will work for you.)

Then, to access the string elements in the "objects" JSONObject, get them out by element name.

String a = objects.get("A");

If you need the names of the elements in the JSONObject, you can use the static utility method JSONObject.getNames(JSONObject) to do so.

String[] elementNames = JSONObject.getNames(objects);

"Get the value for the first element and the value for the last element."

If "element" is referring to the component in the array, note that the first component is at index 0, and the last component is at index getArray.length() - 1.

I want to iterate though the objects in the array and get thier component and thier value. In my example the first object has 3 components, the scond has 5 and the third has 4 components. I want iterate though each of them and get thier component name and value.

The following code does exactly that.

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

public class Foo
{
  public static void main(String[] args) throws Exception
  {
    String jsonInput = "{\"JObjects\":{\"JArray1\":[{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\"},{\"A\":\"a1\",\"B\":\"b2\",\"C\":\"c3\",\"D\":\"d4\",\"E\":\"e5\"},{\"A\":\"aa\",\"B\":\"bb\",\"C\":\"cc\",\"D\":\"dd\"}]}}";

    // "I want to iterate though the objects in the array..."
    JSONObject outerObject = new JSONObject(jsonInput);
    JSONObject innerObject = outerObject.getJSONObject("JObjects");
    JSONArray jsonArray = innerObject.getJSONArray("JArray1");
    for (int i = 0, size = jsonArray.length(); i < size; i++)
    {
      JSONObject objectInArray = jsonArray.getJSONObject(i);

      // "...and get thier component and thier value."
      String[] elementNames = JSONObject.getNames(objectInArray);
      System.out.printf("%d ELEMENTS IN CURRENT OBJECT:\n", elementNames.length);
      for (String elementName : elementNames)
      {
        String value = objectInArray.getString(elementName);
        System.out.printf("name=%s, value=%s\n", elementName, value);
      }
      System.out.println();
    }
  }
}
/*
OUTPUT:
3 ELEMENTS IN CURRENT OBJECT:
name=A, value=a
name=B, value=b
name=C, value=c

5 ELEMENTS IN CURRENT OBJECT:
name=D, value=d4
name=E, value=e5
name=A, value=a1
name=B, value=b2
name=C, value=c3

4 ELEMENTS IN CURRENT OBJECT:
name=D, value=dd
name=A, value=aa
name=B, value=bb
name=C, value=cc
*/

You want something like this..

JSONArray jsonArray = new JSONArray(sJSON);
JSONArray jsonPersonData = jsonArray.getJSONArray(1);
for (int i=0; i<jsonPersonData.length(); i++) {
    JSONObject item = jsonPersonData.getJSONObject(i);
    String name = item.getString("name");
    String surname = item.getString("surname");
}

Not with an iterator.

For org.json.JSONArray, you can do:

for (int i = 0; i < arr.length(); i++) {
  arr.getJSONObject(i);
}

For javax.json.JsonArray, you can do:

for (int i = 0; i < arr.size(); i++) {
  arr.getJsonObject(i);
}

In your code the element dataArray is an array of JSON objects, not a JSON object itself. The elements A, B, and C are part of the JSON objects inside the dataArray JSON array.

You need to iterate over the array

public static void main(String[] args) throws Exception {
    String jsonStr = "{         \"dataArray\": [{              \"A\": \"a\",                \"B\": \"b\",               \"C\": \"c\"            }, {                \"A\": \"a1\",              \"B\": \"b2\",              \"C\": \"c3\"           }]      }";

    JSONObject jsonObj = new JSONObject(jsonStr);

    JSONArray c = jsonObj.getJSONArray("dataArray");
    for (int i = 0 ; i < c.length(); i++) {
        JSONObject obj = c.getJSONObject(i);
        String A = obj.getString("A");
        String B = obj.getString("B");
        String C = obj.getString("C");
        System.out.println(A + " " + B + " " + C);
    }
}

prints

a b c
a1 b2 c3

I don't know where msg is coming from in your code snippet.

Your code is absolutely correct, it works fine with org.json.simple:

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class JsonTest {
    public static void main(String[] args) throws ParseException {
        JSONArray c = (JSONArray) new JSONParser()
                .parse("[ { \"name\":\"test\", \"age\":1 }, "
                        + "{ \"name\":\"test\", \"age\":1 } ]");
        for (int i = 0; i < c.size(); i++) {
            JSONObject obj = (JSONObject) c.get(i);
            System.out.println(obj.get("name"));        
        }
    }
}

It outputs:

test
test

Check how input JSONArray was created. It's possible that there's something different inside it. For example, it's possible that you have non-printable character in key name, so you don't see it when using c.toString(), but obj.get("name") fails.

Instead of pulling the string value of content out of your JSONObject, you can get a JSONArray instead

JSONArray content = mediaObject.getJSONArray("content");

Now you can loop through the objects in your array with a pretty conventional for loop

for(int i = 0; i < content.length(); i++) {
    JSONObject mediaItem = content.getJSONObject(i);
    boolean itemIsDefault = mediaItem.getBoolean("isDefault");
}

Here are the links to all the JSONObject methods and JSONArray methods