5RUNTIME POLYMORPHISM

One day Trurl the constructor put together a machine that could create anything starting with n.—Stanislaw Lem, The Cyberiad

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In this chapter, you’ll learn what polymorphism is and the problems it solves. You’ll then learn how to achieve runtime polymorphism, which allows you to change the behavior of your programs by swapping out components during program execution. The chapter starts with a discussion of several crucial concepts in runtime polymorphic code, including interfaces, object composition, and inheritance. Next, you’ll develop an ongoing example of logging bank transactions with multiple kinds of loggers. You’ll ...

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