10.1. Introduction
Given a package of classes and their interfaces, would you ever want to look within, to see how the classes work? Indeed, there are several reasons not to look beneath the method signatures of the classes. By relying strictly on the interface and not on how the code supports it, you free your code from dependencies on how another package works. The separation of interface and execution is a cornerstone of several advances in applied computer science, especially distributed computing and component development.
On the other hand, professional developers often want to look beneath the signatures of methods they rely on. In the general case, this examination may help you to understand in detail the exact performance of a method. ...
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