intricacies of Inner Classes

“One Cannot refer to a non-final variable form inside an inner class defined in a different method”

public void onModuleLoad() {
// TODO Auto-generated method stub

final FormPanel form = new FormPanel(); –> Has to be final in order to be accessed from an inner class method.

VerticalPanel vpanel = new VerticalPanel();

vpanel.add(form);

vpanel.add(new Button(“Submit”, new ClickListener() {
public void onClick(Widget sender) {
form.submit(); –> Here the final form object is being accessed
}
}));

}