How to check if JPassword field is null

Question

I want to check the username and password in Swing.

The check works for username, but it doesn\'t work for JPaswordfield. I am posting the related code:

Answer 1

Very simple get the text using JPasswordField#getPassword() which returns a char[] of the text, then simply get the length of the array and check if it is equal to 0:

JPasswordField jpf...

if(jpf.getPassword().length == 0) {
    // it is empty
}else {
   // it is not empty
}