Determine wether JPasswordField is empty

I have the following code:
if (usernameField.getText().equals(""))
                    JOptionPane.showMessageDialog(null, "Must enter username & password.","No credentials",JOptionPane.ERROR_MESSAGE);
               }I also have a JPasswordField that I would like to check, to see wether any values are entered, the getPassword method returns a char array; what would be the best way to determine wether the field is empty? Any suggestions greatly appreciated.

.lengthMel

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