code: public long getLong(int index) throws JSONException {
          Object object = this.get(index);
          try {
              return object instanceof Number ? ((Number) object).longValue()
                      : Long.parseLong((String) object);
          } catch (Exception e) {
              throw new JSONException("JSONArray[" + index + "] is not a number.");
          }
      }
docs: Get the long value associated with an index.
  
  @param index
  The index must be between 0 and length() - 1.
  @return The value.
  @throws JSONException
  If the key is not found or if the value cannot be converted
  to a number.