Example: CallCenter

Application: We want to realize a program for a call-center that handles requests for telephone numbers. Specifically, a certain client requests the telephone number associated to a certain person name in a certain city, and the operator answers to the request by selecting the telephone registry of the city and searching there the telephone number corresponding to the person name.

• Objects:
  • client
  • operator
  • telephone registry
  • telephone numbers, person names, cities - these are just character sequences (strings)

• Operations:
  1. request for the telephone number of a given person name in a given city, done by a client
  2. selection of the telephone registry of the requested city, done by the operator
  3. search of the telephone number corresponding to the requested person name on the telephone registry

The program has to represent all objects that come into play and realize all operations.