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output of this code

 
Greenhorn
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What will be the output of this program and Why???

 
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What was the output when you tried it??
 
Greenhorn
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Ankit Your website seems to be down for more than aweek any problem and when can i access it???
 
Ankit Garg
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annamalai bala wrote:Ankit Your website seems to be down for more than aweek any problem and when can i access it???



Please refrain from starting personal talks in the forum. You can send me a personal message for things like this. I'm working on a different site right now that will replace the current one...
 
Ankit Garg
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Nipun, please Use The Forum Not Email.

You've sent me on email that the output was "result of A:30" which is quite clear to me. The two add methods are overloaded, and since you didn't provide any arguments, so the add method of class A was called...
 
Greenhorn
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class b extends a
{
int a=100,b=200;



i thought instance variables can not be overridden...and since they are not inside a method, this is not shadowing as well.
So, why is it not giving compilation time error?
 
author
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Reena Kapoor wrote:
i thought instance variables can not be overridden.



THey are not being overridden -- depending on the type of the reference, dereference it to get to the instance variables will get different results.

Henry
 
Greenhorn
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Instance variables can be shadowed in a inheritance hierarchy. What is important to understand here is that variable references are resolved at compile-time and method invocations resolved at run time.

In this case if you do:



you will get:

result of A:30



if you do:



you will get:

result of B:300



because code executing within b will see the a and b shadowing the corresponding vars in the superclass a.
 
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