说明：  用Java实现的电梯模拟程序。某公司要建造一栋n层的办公楼并用“最先进“的电梯进行装备，公司希望开发一个Java applet模拟电梯操作，从而决定它是否符合公司的要求。 这部电梯能够容纳n个人，为节约能源，只有在需要时才运行。每天的开始，电梯关着门停在办公楼的底层，当然，电梯的运行方向是升降交替的。 要求模拟器具有一个简单的图形用户界面――一个只包含“New Person“按钮的applet。
(Using Java to achieve elevator simulation program. A company to build an n-storey office building of the most advanced for the elevator equipment, the company hopes to develop a Java applet simulation of the lift operation, so as to determine whether it meets the requirements of the company. The elevator can accommodate n individuals, in order to save energy, only to run when needed. The beginning of each day, elevator doors closed parked in the bottom of the office building, of course, is the direction of the elevator landing and taking off the turn. Asked simulator with a simple graphical user interface- contains only a New Person button applet.)