How to unmask a JavaFX PasswordField or properly mask a TextField?

Question

In a UI of mine, I have a PasswordField like so (urm the one at the bottom!):

Answer 1

I know this is older, but i was searching for answer and this is my solution:

@FXML
private JFXButton showpassword;
private String password;

showpassword.addEventFilter(MouseEvent.MOUSE_PRESSED, e -> {
            password = passwordField.getText();
            passwordField.clear();
            passwordField.setPromptText(password);
        });
        showpassword.addEventFilter(MouseEvent.MOUSE_RELEASED, e -> {
            passwordField.setText(password);
            passwordField.setPromptText("Password");
        });

Using button with graphic like "WIN10 Eye - unmask password"