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...Hanspeter mossenbock object oriented programming in oberon second edition springerverlag berlin heidelberg this book is out of print and made available as pdf with the friendly permission contents overview procedure thinking languages how oop differs from conventional classes abstraction mechanisms history summary features declarations expressions statements procedures modules commands data concrete structures abstract types methods examples common questions xii inheritance type extension compatibility a base its static dynamic run time checking extensibility an sense binding messages message records typical applications generic components heterogeneous replaceable behavior adaptable semifinished products useful techniques initialization objects extending system at persistent wrapping other multiple dimensions models views iterators modifying inherited design functional identifying designing interface class relationships between when to use xiii errors...