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What s the big deal about object orientation anyway First and foremost, it s about modeling the real world. Here are some examples: Rather than being concerned about a particular process, the emphasis is on independent entities that can actually perform the process. Rather than write one large procedure that does everything, and would also need to be tossed if the process in question changed, it s about assigning the appropriate parts of a procedure to the various role players in the procedure. Instead of having one large program, it s about modularity having multiple, independent, and reusable components that act appropriately together to complete an act of work. So it s about teamwork.
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Object orientation has three key tenets: Encapsulation: This refers to packaging related data and methods together. Object orientation is the natural way to think about things; natural, as in nature. It s the way nature does it. Nature creates things that have both attributes and behavior. For example, I don t think about eating, and then you go eat what I want. It doesn t work that way. My thoughts about food affect me, not you. We are separate entities. All my attributes and behaviors are encapsulated in me. All your attributes and behaviors are encapsulated in you. If someone tells each of us to do something, odds are, we ll do it differently, or may not do it at all. How s that for modularity Inheritance: This is the ability to reuse the data and methods of a more abstract type. If we continue on about the idea of asking each of us to perform a particular task, we ll most likely do it differently because we inherited different genetic attributes from our parents, and they taught us different behaviors, too. So we inherited different attributes and behaviors from our parents, upon which we will add new ones, or override what our parents taught us and do it our own way.
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CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !
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Polymorphism: This refers to hiding different implementations behind a common interface. Polymorphism is the use of the same name for a particular behavior, yet knowing that each object, or person in our case, may perform the behavior differently. If I m asked to clean the floor, I ll get out the vacuum cleaner, and then follow up by washing the floor with a bucket of clear water, while you may hire someone to do the job. All the same, the floor gets cleaned, and that s the behavior that was requested. Using these three tenets, you can naturally model both the attributes and behavior, or data and methods, for any real-world entity. Let s talk more about reuse.
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Reuse
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Just what the heck is reuse anyway I consider it reuse any time you can abstract multiple lines of code into a larger block of code that will then be called by more than one actor. I also think there are multiple levels of reuse. Let s start with the smallest unit of reuse: method-level reuse.
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Method-Level Reuse
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I always tell programmers who I work with that if they must code the same lines of code more than once to accomplish the same task, then they need to create a method. That s what I call method-level reuse. The trick is where to put the method. That s an easy question to answer for an object-oriented programmer: put the method with the entity that s executing the behavior! That s what objectorientation is all about. Next up is what I call component-level reuse.
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