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95
votes
12answers
38k views

Why do we need private variables?

Why do we need private variables in classes? Every book on programming I've read says this is a private variable, this is how you define it but stops there. The wording of these explanations always ...
61
votes
13answers
6k views

Why is it a good idea for “lower” application layers not to be aware of “higher” ones?

In a typical (well-designed) MVC web app, the database is not aware of the model code, the model code is not aware of the controller code, and the controller code is not aware of the view code. (I ...
12
votes
6answers
1k views

Method chaining vs encapsulation

There is the classic OOP problem of method chaining vs "single-access-point" methods: main.getA().getB().getC().transmogrify(x, y) vs main.getA().transmogrifyMyC(x, y) The first seems to have ...
4
votes
4answers
586 views

Are trivial protected getters blatant overkill?

Something I really have not thought about before (AS3 syntax): private var m_obj:Object; protected function get obj():Object { return m_obj; } private var m_str:String; protected function get ...
9
votes
6answers
2k views

Why did Java make package access default?

I'm asking this question because I believe they did it for a very good reason and that most people do not use it properly, well from my experience in industry so far anyway. But if my theory is true ...
35
votes
8answers
5k views

What should be allowed inside getters and setters?

I got into an interesting internet argument about getter and setter methods and encapsulation. Someone said that all they should do is an assignment (setters) or a variable access (getters) to keep ...
20
votes
6answers
1k views

Should I place functions that are only used in one other function, within that function?

Specifically, I'm writing in JavaScript. Let's say my primary function is Function A. If Function A makes several calls to Function B, but Function B is not used anywhere else, then should I just ...
27
votes
6answers
3k views

Using third-party libraries - always use a wrapper?

Most projects I am involved with use several open-source components. As a general principle, is it a good idea always to avoid binding all components of the code to the third-party libraries and ...
3
votes
4answers
620 views

Using lambdas to improve encapsulation

Just as many people believe tenaciously in small functions, some people believe lambdas should only contain small code fragments. An often overlooked advantage of lambdas however, is using them you ...
11
votes
4answers
850 views

Nested Classes: A useful tool or an encapsulation violation?

So I'm still on the fence as to whether or not I should be using these or not. I feel its an extreme violation of encapsulation, however I find that I am able to achieve some degree of encapsulation ...
6
votes
4answers
2k views

Is JavaBeans a good example of encapsulation?

I'm trying to understand if JavaBeans is a good example of encapsulation. In my view, it's not as usually all the internal state is exposed through getters and setters. A simple example is public ...
5
votes
5answers
644 views

Should I always encapsulate an internal data structure entirely?

Please consider this class: class ClassA{ private Thing[] things; // stores data // stuff omitted public Thing[] getThings(){ return things; } } This class exposes the ...
5
votes
3answers
1k views

How important is encapsulation? [duplicate]

As a student in programming, I learned that encapsulation is one of the most important principles of object-oriented programming. However, I only follow that principle when I feel like it suits my ...
23
votes
4answers
1k views

Why Java doesn't make use of encapsulation with some classes?

My question is related with System.in and System.out classes (there might be others like those in the Standard library). Why is that? Isn't that a bad practice in OOP? Shouldn't it be used like: ...
16
votes
9answers
1k views

Hiding away complexity with sub functions

I am having a discussion on code style, and it's starting to sound like a "matter of taste". I strongly believe otherwise, so I'm writing this to get your opinion and learn from your arguments for and ...
7
votes
6answers
4k views

Are Get-Set methods a violation of Encapsulation? [duplicate]

Possible Duplicate: When are Getters and Setters Justified In an Object oriented framework, one believes there must be strict encapsulation. Hence, internal variables are not to be exposed ...
5
votes
2answers
238 views

What defines an encapsulation properly?

I find the encapsulation concept a bit confusing. So far I have read that the members of the class should be private and any access to private members must be through getter and setter methods, which ...
-2
votes
2answers
124 views

Why public access level method get overridden in java?

This question is raised with a clarification required to decide when to declare a method protected or public during class design of a package. My point is, if one needs to override a method of a ...