Java charAt() String index out of range: 0

Question

I have this code :

private void submitPstart() {

    if (tStock.getText().charAt(0)>=\'A\' && tStock.getText().charAt(0)<=\'Z\'){


    }else          


        

Answer 1

You need to check if getText() returns a 0-length (i.e. empty) string.

If it does, then don't try to pull the first character out! (via charAt())

Note that your commented-out check for length() should occur prior to the existing character check.

You may want to check for a null string being returned as well, depending on your framework/solution etc. Note the Apache Commons StringUtils.isEmpty() method, which performs this check concisely.