Private, protected advantages, disadvantages

Hi,
Is there a significant difference between private and protected instead of the sight in the package?
The question is cause of the often usage of protected in "official" code instead of private.
regards
Olek

Navy_Coder wrote:
Olek wrote:
Hi,
Is there a significant difference between private and protected instead of the sight in the package?
The question is cause of the often usage of protected in "official" code instead of private.
regards
Olek??? What do you mean by "official" code? I write "official" code (or so I thought any way) and I use significantly more private variables than protected.Me too. I tend to follow the doctrine that a variable should be private unless there is a good reason for it not to be. I always restrict access as far as seems reasonable, and rarely ever use protected variables. I find there are very few examples of times I think I need access to a super class's data members. On occasion, I will use protected methods or protected constructors, but there again, if I don't need them to be protected, I'm definitely going to make them private, instead.
- Adam

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I would like to express that something like "private protected" is really missing. I develop packages for modelling of engineering structures. I have real and clear example why I need this. I was very surprised that I cannot open fields for subclasses only! Therefore I have to use "private" because I dont want to see these fields from another classes. It does not make sense in this way.
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I like Java, but this is wrong. Why it is not possible?

kitnarf wrote:
There is my example:
Imagine that there is a model for analysis of a engineering structure. This model can be 2D or 3D. Im developing three packages. First, the most abstract, contains classes useful in both 2D and 3D branches. For example class AbstractMassPoint, which has field mass. Second package is 2D brach and third package is 3D branch. In 2D and 3D branch are subclasses of AbstractMassPoint named MassPoint. I both versions of MassPoint class are relationships using mass field and one natural solution is access it directly without using getMass() method. But I like encapsulation and I dont want to see this field outside class AbstractMassPoint except subclases MassPoint which are natural subclasses. Modifier protected is too weak. I dont want to see this field in classes from package. Therefore current state is private modifier and something like getMass() methods. You can see source codes on my page (keywords: kitnarf's library, fydik).
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