我有一个带有一些输入字段的窗格，在将文本输入字段时，验证工作正常， 如果提交按钮如何触发选中的输入字段进行验证，请建议我们 验证javafx中的输入控件，如果我单击“提交”按钮，则要显示所有输入控件验证消息。

static RequiredFieldValidator usernmeEmptyValidator = new RequiredFieldValidator();
    public static GridPane getEmplyee() {

        Label titles = new Label("Monitor");


        JFXTextField firstName = new JFXTextField();
        firstName.setLabelFloat(true);
        firstName.setPromptText("First Name");
        emptyValidator(firstName,"Please Enter first Name");

        JFXTextField lastName = new JFXTextField();
        lastName.setLabelFloat(true);
        lastName.setPromptText("Last Name");
        emptyValidator(lastName,"Please Enter last Name");

        JFXTextField mobile = new JFXTextField();
        mobile.setLabelFloat(true);
        mobile.setPromptText("Mobile");

        JFXTextArea address = new JFXTextArea();
        address.setPromptText("Address:");

        address.setStyle("-fx-background-color: #d1e0e0;");
        JFXButton submit = new JFXButton("Submit");
        GridPane gridPane = new GridPane();

        gridPane.add(titles,0);
        gridPane.add(firstName,1);
        gridPane.add(lastName,2);
        gridPane.add(mobile,3);
        gridPane.add(address,4);
        gridPane.add(submit,5);

        gridPane.setPadding(new Insets(50,50));
        gridPane.setVgap(40);

        submit.setOnaction(e -> {

        //

        });

        return gridPane;

    }



public static void emptyValidator(JFXTextField textField,String message) {

        textField.getValidators().add(usernmeEmptyValidator);
        usernmeEmptyValidator.setMessage(message);
        textField.focusedProperty().addListener(new changelistener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observable,Boolean oldValue,Boolean newValue) {

                if (!newValue) {
                    textField.validate();

                }
            }

        });
    } ```