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...Introduction creational structural behavioral c designpatterns p ronchese dipartimento di fisica e astronomia g galilei universita padova object oriented programming and course design patterns a pattern is acommonsolutionfor common problem they became popular due to book by erich gamma richard helm ralph johnson john vlissides known as the gang of four whoidentied described classic adesign not an algorithm repeatable solution or approach can be classied in main categories classication are depending on address deal with creation singleton abstract factory builder prototype...