Now, define a frame class, which will represent the main window of your application.
现在开始定义框架类，它代表应用程序中的主窗口。
Class and interface names begin with a capital letter, as in Frame.
类和接口名以大写字母开头，如Frame。
Calligraphy class frame beat class ancient kite class thespian performance class.
书法班、架子鼓班、古筝班、戏剧表演班等。
Calligraphy class frame beat class ancient kite class thespian performance class.
书法班、架子鼓班、古筝班、戏剧表演班等。
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