java.lang.NumberFormatException: empty String

Question

The code below keeps giving a java.lang.NumberFormatException: empty String:

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt         


        

Answer 1

The string you're trying to parse as double is empty. You need to check if the getText() method returns a non empty string before trying to do the parsing cause you can't parse to double an empty string.