本文深入探讨了双重调度设计模式的核心概念，详细解释了元素接受方法如何实现运行时的覆盖及访问方法在编译时的重载。通过两种不同类型的调度实例，展现了该设计模式在实际应用中的灵活性。
Tow dispatchs take place at the following places:
1. Invoke of Element.accept : overide of accept
2. Inplemention of Element.accept : overload of visit.
the core concept of double dispatch is the accept Method.
The first dispatch takes place at run time, which is override just right. accept method needs only one signature.
the second dispatch takes place at compile time, which is overload just right. visit method nees multiple signature.
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