sample gwt bad code

sample.java

final FormPanel form = new FormPanel();
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);
form.addStyleName("table-center");
form.addStyleName("demo-FormPanel");

VerticalPanel holder = new VerticalPanel();

holder.add(new Label("User ID"));
TextBox userid = new TextBox();
userid.setName("userid");
holder.add(userid);

holder.add(new Label("Password"));
PasswordTextBox passwd = new PasswordTextBox();
passwd.setName("passwd");
holder.add(passwd);

holder.add(new Button("Submit", new ClickListener()
{
    public void onClick(Widget sender)
    {
        // form.submit();
    }
}));

form.add(holder);

// form.setAction("url");

form.addFormHandler(new FormHandler()
{
    public void onSubmit(FormSubmitEvent event)
    {
        // if (something_is_wrong)
        // {
        // Take some action
        // event.setCancelled(true);
        // }
    }

    public void onSubmitComplete(
        FormSubmitCompleteEvent event)
    {
        Window.alert(event.getResults());
    }
});

RootPanel.get("demo").add(form);