Re: Class ... implements ...
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Lew <noone@lewscanon.com> writes:
Merciadri Luca wrote:
I'm given the following program snippet:
==
class C1
{
public int n;
}
interface I1
{
int f();
}
class C2 extends C1 implements I1
{
public int f()
{
n = 18;
}
}
==
I need to say if the following expressions are valid or not
(justifications are trivial once I'm sure of the answer):
Sure, it is an awful lot easier to do your homework once someone has
given you the answers. We know.
This is an extremely rude remark, especially when one does not know a
lot about somebody.
But it seems rude that you ask for answers to your homework and
haven't even tried to do the research yourself first. Maybe somewhat
more actionable than rude, even.
Same remark.
Perhaps if you tell us first what you are thinking or trying, it will
help counteract that unfortunate impression that you are trying to,
ahem, cut corners.
1. C1 obj_1 = new C2();
2. C2 obj_2 = new C1();
3. I1 obj_3 = new C2();
4. I1 obj_4 = new I1();
5. C2 obj_5 = new I1();
I've found that 1. and 3. are valid, when the others (2., 4. and 5.)
are invalid. Am I right?
I told you what I thought valid and invalid. But you might have been
distracted during this moment. Anyway, 2., 4. and 5. are invalid, just
the way I guessed.
I was hesitating on these answers, but if my answers are right (and
they are, according to the compiler's output), I can justify them. So
there is no problem anymore. Closed thread.
- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --
Fine feathers make fine birds.
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