现在开始定义框架类，它代表应用程序中的主窗口。
Now, define a frame class, which will represent the main window of your application.
maingui类包含了主窗口中的GUI对象，它位于appobjects文件夹之下。
The MainGUI class contains the GUI objects in the main window, and it is placed under the appobjects folder.
为了实现该侦听器类，我们将在主资源管理器窗口中编码一个匿名类。
To implement this listener class, we'll code an anonymous class in the main Explorer Window.
SDI应用的主框架窗口的基类。也是所有其它框架窗口类的基类。
The base class for an SDI application's main frame window. Also the base class for all other frame window classes.
SDI应用的主框架窗口的基类。也是所有其它框架窗口类的基类。
The base class for an SDI application's main frame window. Also the base class for all other frame window classes.
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