Question

I receive some data as a JSON response from a server. I extract the data I need and I want to put this data into a string array. I do not know the size of the data, so I cannot declare the array as static. I declare a dynamic string array:

String[] xCoords = {};

After this I insert the data in the array:

   for (int i=0; i<jArray.length(); i++) {
         JSONObject json_data = jArray.getJSONObject(i);
         xCoords[i] = json_data.getString("xCoord");
   }

But I receive the

java.lang.ArrayIndexOutOfBoundsException
Caused by: java.lang.ArrayIndexOutOfBoundsException

What is the way to dynamically insert strings into a string array?

Answer 1

Use ArrayList although it is not really needed but just learn it:

ArrayList<String> stringArrayList = new ArrayList<String>();

   for (int i=0; i<jArray.length(); i++) {
         JSONObject json_data = jArray.getJSONObject(i);
         stringArrayList.add(json_data.getString("xCoord")); //add to arraylist
   }

//if you want your array
String [] stringArray = stringArrayList.toArray(new String[stringArrayList.size()]);