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.
wicket框架中，主应用类必须继承org . apache . wicket . protocol . http . WebApplication, Web页面可以在主应用类的init方法中进行装载。
In wicket framework, web pages can be mounted in init method of the main application class, which has to inherit from org.apache.wicket.protocol.http.WebApplication.
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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