You'll notice that the code sample is set up to be useful as a test bed for different UI widgets and layouts ideas.
您会注意到，代码示例被设置为适合用作不同用户界面小控件和布局想法的测试温床。
We don't really want to use an applet for the UI of our final application, but it provides an easy way to test out the code.
实际上，我们不需要将Applet用于最终应用程序的UI，但是它提供了测试代码的简单方法。
The framework enforces the separation of UI modules from the test code, allowing easy refactoring.
框架实行UI module和测试代码的分离，从而有利于重构。
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