Afterword
Responsibilities, dependencies, interfaces, ducks, inheritance, behavior sharing, composition, and testing—you’ve learned it all. You’ve immersed yourself in a world of objects, and if this book has achieved its goal, you think differently about objects now than when you first began.
Chapter 1, “Object-Oriented Design,” stated that object-oriented design is about managing dependencies; that statement is still true, but it’s just one truth about design. A deeper truth is that there is a way in which all objects are identical, regardless of whether they represent entire applications, major subsystems, individual classes, or simple methods. A single object never stands alone; applications consist of objects that are related to one another. ...
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