子程序、引用和数据结构。
没有发现引用源。不像抽象的类型一样，接口不能宣布构件或者数据；它是用于定义可以激活子程序的签名的基础。
Unlike an abstract type, an interface cannot declare components or data; it is used instead as the basis of defining the signatures of subprograms that can be invoked.
Figure 2是我将在整个文章引用的例子程序的一个屏幕快照。
Figure 2 shows a screenshot of the sample application that I will be referring to throughout this article.
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