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quick easy points!  very simple question about class variables!

Posted on 2006-05-04
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Last Modified: 2010-03-31
This is one of those little questions that bugs the hell out of me, but I always felt like I should know the answer to it without much though.  I gave up being frustrated about it, so here's the question ....  If I'm writing a class that is seperate from the driver, it seems that when I declare the variables outside of the constructor or any other method, I can access them without having to declare them static.  If I'm working with the main class that has the driver in it, and I declare the variables in the same manner, I'm unable to access them as I normally would unless I declare them static.  

Why is this?  

50 points seems barely worthwhile, so I made the answer worth 100 points!   :)
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Question by:trs28
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Accepted Solution

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hoomanv earned 400 total points
ID: 16608331
> I can access them without having to declare them static
an instance has access to its static and non-static members

>  If I'm working with the main class that has the driver in it, and I declare the variables in the same manner, I'm unable to access them as I normally would unless I declare them static.  

because main() is static and a static method can only access static fileds

class A {
    String s1;
    static String s2;

    f() {
        s1, s2 are accessible
    }

    static g() {
        only s2 is accessible
    }
}
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Author Comment

by:trs28
ID: 16608347
God, I knew it was something that simple!   Thanks!
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Expert Comment

by:CEHJ
ID: 16608379
>>
it seems that when I declare the variables outside of the constructor or any other method, I can access them without having to declare them static.
>>

Variables declared *inside* the ctor or any other method are local to that ctor or method and cannot be accessed outside it
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Author Comment

by:trs28
ID: 16608412
yeah, i knew that one CEHJ, but It was the main method that was throwing me off on the whole encapsulation thing!  Thanks though!
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