How can I get the data from an array inside another array that stores values in Java?

Question

I have an array and this array has another array inside.
I need to obtain the data inside this other array.

This is the code that I use to get all the array items, but I am not sure how to get the other array elements that are stored at index(0) .

if (msg.equals("warning")) {
    List<String> dataWarn = (ArrayList<String>) data;
    Log.i("api", dataWarn.toString());
}

Answer 1

I think you're almost there. Just get the first element from the list twice:

if (msg.equals("warning")) {
    List<String> dataWarn = (List<String>) data;
    List<String> dataWatnItem0 = (List<String>) dataWarn.get(0);
    Log.i("api", dataWatnItem0.get(0).toString());
}