If you're reading this book, you probably do not need to be convinced that object- oriented programming is a good thing. However, as the chapter quote from Bjarne Stroustrup so eloquently puts it—not all OOP is a good thing. Like any tool, if used inappropriately, it can make a royal mess of any well-intentioned project.
We create classes as a way to group logically related data and behavior that's all geared toward performing a certain task. When these classes are written properly, they exemplify the benefits of OOP: increased reuse and the creation of testable, reliable, predictable applications that are easy to build, easy to maintain, and easy to change.
On mobile devices, we have classes that encapsulate information and behaviors for all kinds of things from reading GPS coordinates, to displaying text, to accepting input. Without a carefully architected suite of classes that abstract all the capabilities of a device, we would never be able to rapidly and reliably produce software for that device.
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