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I think:
- ajeet July 06, 2010ask question querying what part of designing elevator he wants, kinda clarifying with him that all the physical system exists, and you have few magical classes for input and output that will do actual work.
YOur work will be to co-ordinates the input classes with output/work classes.
First ask how much time you have ?
What level of details you expect ? (HLL / UML / low level / algo / interfaces)
1. First define i/p o/p interface.
2. The code converting messages from ip to op.
Design state automata for that
3. Dont forget to make the desgin testable
4. Algo duplication / code duplication if correctness is EXTREMELY important.
(e.g. suppose the elevator was used save the world mission of armageddon mission)
5. Design for extension. No limit on floor numbers, or teleporting between floors,
multiple lifts.
Think of partial lifts. No all lifts stop at every floor. et cetra ...
By the time you touch all the features, and put a basic UML, 1 hour will be up and he will be impressed by your wide thiking.....