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 must check null and length greater than 0.

 if (tStockPIStart!=null && tStockPIStart.getText().length()>0 && tStockPIStart.getText().charAt(0)>='A' && tStockPIStart.getText().charAt(0)<='Z'){