Issue with filewriter and filereader

Question

I made a code which for change password in a local program i made. It is working almost very well, but i ran into a little issue. If i change the new password to "" (nothing), the file which are reading the password, doesnt works if i leave the field empty. It works fine if i type in a normal password like "hey". The password is stored in a txt file, so the problem is, that an empty JTextField doesnt equal an empty log file.. why? I need a fix of this. I would like it to work with the password (nothing), but some alternative fixes would be cool too.

This code checks password:

check is the string from readfile, and password is the string from my textfield.

if(event.getSource()==tf&&password.equals(check)){
  try{
    Runtime.getRuntime().exec("C:\\Windows\\System32\\notepad C:\\Applications\\Infostore.txt");
  }catch(IOException ex){
    ex.printStackTrace();
  }
  System.exit(1);
}else{
  JOptionPane.showMessageDialog(null,"Wrong password");
}

The password creater is an ordinary filewriter, which gets content from textfield, and write it in a txt file.

Answer 1

Test the value of your JTextField before saving the password.

if (textField.getText()==null) passwd = "";