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replace conditional with polymorphism you have a conditional that chooses different behavior depending on the type of an object move each leg of the conditional to an overriding method in a subclass make the original method abstract the essence of polymorphism is that allows you to avoid writing an exclusive conditional when you have objects whose behavior varies depending on their types polymorphism gives you many advantages the biggest gain occurs when this same set of conditions appears in many places in the program if you want to add a new type you have to find and update all the conditionals but with subclasses you just create a new subclass and provide the appropriate methods how to perform this first prepare the code with replace type code with subclasses or replace type code with state or strategy refactorings we have discussed them in previous lectures second if necessary apply move method refactoring to place the conditional at the top of the inherited structure third create