Sun's sample quest #2

[bill bozeman]

Can anyone explain this one. I was a little confused by it. I will hold on giving the answer they have so you can try it yourself first, in case you haven't looked at it yet.
2. Given:
1.public class OuterClass {
2. private double d1 = 1.0;
3. //insert code here
4.}
You need to insert an inner class declaration at line 3. Which two inner class declarations are valid?(Choose two.)
A.class InnerOne{
public static double methoda() {return d1;}
}
B.public class InnerOne{
static double methoda() {return d1;}
}
C.private class InnerOne{
double methoda() {return d1;}
}
D.static class InnerOne{
protected double methoda() {return d1;}
}
E.abstract class InnerOne{
public abstract double methoda();
}
Thanks for the help!
Bill

[Viji Bharat]

Bill:
I think C and E are correct.
Reasoning:
Choice A - Incorrect because static method methoda() cannot access non-static var d1
Choice B - Incorrect - same as choice A
Choice C - Correct - Inner class can be declared private and methods in inner class as in this case have access to member vars of outer class
Choice D - Incorrect - d1 cannot be accessed inside static class
Choice E - Correct
HTH

[deekasha gunwant]

Hi,
I also agree with Viji.
C,E are correct.
regards
deekasha

[Jane Griscti]

Hi Bill,
A and B are wrong as Inner Classes cannot declare static initializers or members unless they are compile time constants. JLS§8.1.2
D is wrong because non-static variables cannot be accessed from a static context.
Which leaves C and E as the correct answers.


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Jane