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Define an interface for creating an object, but let subclasses decide which class to instantiate factory method lets a class defer instantiation to subclasses overview the factory design pattern is useful when a class cannot anticipate the class of objects it must create or when a class wants its subclasses to specify the 1 using system; 2 using systemcollections; 3 4 class factorypattern { 5 6 // factory method pattern judith bishop 2006 7 8
As we can see there the most intuitive solution to avoid modifying the factory class is to extend it this is the classic implementation of the factory method pattern modeling create a new project design patterns create a class diagram abstract factory select class from diagram toolbar click on the diagram to create a class example: java sample code // factories package comapwebcopatternsgofabstractfactory; public abstract class financialtoolsfactory { public abstract taxprocessor