框架 G要创建一个用户界面,需要创建一个 框架或 applet来存放用户界面组件。 FI rame Pull-down menus Applet Pull-down menus Panel Panel User Interface Components (un) User Interface User Interface Components Panel Panel Panel User Interface User Interface Panel Panel Panel Components Components panel框架 )要创建一个用户界面，需要创建一个 框架或applet来存放用户界面组件。 Frame Pull-down Menus User Interface Components (UI) Panel Panel Panel UI Panel UI Panel UI Applet Panel User Interface Components Panel User Interface Components Panel User Interface Components Panel User Interface Components panel Pull-down Menus