进行覆盖功能时，我是否必须匹配参数/参数？

public static function createPopUp(parent:DisplayObject,
                                   className:Class,
                                   modal:Boolean = false,
                                   childList:String = null,
                                   moduleFactory:IFlexModuleFactory = null):IFlexDisplayObject
{   
    return impl.createPopUp(parent, className, modal, childList, moduleFactory);
}