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.

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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.

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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.

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