ch10 q2

[zheng li]

import static java.lang.System.*;
class _ {
	public static void main(String... __A_V_) {
		String $ = "";
		for (int x = 0; ++x < __A_V_.length;)
			$ += __A_V_[x];
		out.println($);
	}
}
java _ - A .
What is the result
A. -A
B. A
C. -A
D. _A
E. _-A
F. Compilation fails
G. An exception is thrown at runtime

and the answer is B
but I got result of "A .".

[Jesper de Jong]

Do you mean chapter 10, question 2 in the SCJP Study Guide by Kathy Sierra and Bert Bates? Please mention that (or at least "K&B").

[Deepak Bala]

Jesper Young wrote:Do you mean chapter 10, question 2 in the SCJP Study Guide by Kathy Sierra and Bert Bates? Please mention that (or at least "K&B").

# class _ {

Surely anyone naming a class _ should be shot, stabbed and then shot again. I dont think this is from Kathy and Bert's book

[Jason Irwin]

Deepak Bala wrote:Surely anyone naming a class _ should be shot, stabbed and then shot again. I dont think this is from Kathy and Bert's book

Quite probably, but it is a legal class name and thus could appear in the exam. To be honest, lots of the code I see in the books and mocks would result in physical or verbal violence!

Anyway, to the question from the unknown book of darkest mysteries....

Class "_" is called with parameters "-", "A" and "."
Now, the thing to note is the increment section of the "for" loop. It's "++x", so x will never actually be zero in this loop, it will have the values 1 and 2.
Thus the output is "A."

And if you run the code (you did run the code, didn't you, to confirm for yourself?) that is what you get.

So either the code presented here is not what was in the book, or the options given are wrong.

[Sachin Adat]

Deepak Bala wrote:I dont think this is from Kathy and Bert's book

I think I saw a question like this in K&B......Self Test......

[Jason Irwin]

Sachin Adat wrote:I think I saw a question like this in K&B......Self Test......

Yeah, I'm sure it's K&B being evil with extra evil, a side of evil and an extra-large evil shake.

[Sachin Adat]

Jason Irwin wrote:Yeah, I'm sure it's K&B being evil with extra evil, a side of evil and an extra-large evil shake.

Sure they are in the book, but when you are giving the exam, its just cakewalk.........
You feel its so easy.......they really toughen you for the exam.

But, anyone giving the exam beware of being careless, sometimes it makes you overconfident when you see easy questions.
You may jump straight into a pitfall....

[Lucas Smith]

The right answer is:
A.
I spotted the lack of .

[Mo Jay]

zheng li , please before you post something next time make sure to investigate carefully the output to make sure there is really a mistake in the book before posting a question like this. This question should not have been posted in the first place if you would have notice the dot(.) in the output.

[Palash Kumar]

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