离散事件仿真。电梯运行的一个模拟，实现了对离散事件按事件触发的仿真。-Discrete event simulation. A simulation run the elevator, the realization of discrete event simulation is triggered by the event.

该计算器有两个主要部分，标准计算器和科学计算器，科学计算器功能尚未完成。 用的知识：按钮，菜单，布局，面板，窗口，事件，对话框，标签，单选钮。 有兴趣的读者可以完成剩下的功能。 -The calculator has two main parts, the standard calculator and a scientific calculator, scientific calculator function has not been completed. Knowledge:

这是一个事件驱动异步、线程池的代码。使用actor模式。里面蕴含的思想方法有一定启发意义。-This is an event-driven asynchronous thread pool code. Using the actor model. Which contains a certain way of thinking instructive.