请问这个是CALLBACK的语法么？？谁用过能不能详细解释一下，谢谢～～

1 以下为何种语法？CallBack ?
    public static final ActionFactory QUIT = new ActionFactory("quit") {//$NON-NLS-1$
       
        /* (non-Javadoc)
         * @see org.eclipse.ui.actions.ActionFactory#create(org.eclipse.ui.IWorkbenchWindow)
         */
        public IWorkbenchAction create(IWorkbenchWindow window) {
            if (window == null) {
                throw new IllegalArgumentException();
            }
            IWorkbenchAction action = new QuitAction(window);
            action.setId(getId());
            return action;
        }
    };