try-catch

[Jui Mahajan]

public class Question16 {
public static void main(String[] args) {
int i = 2;
try {
if((i/=(int)Math.floor(Math.random())) > 1)
System.out.println("No arithmetic exception");
} catch (ArithmeticException ae){
System.err.println("Arithmetic exception caught");
}
System.out.println(i);
}
}
the ans is iis 2.
my question is. why is the value of i printed as 2, the value of i got changed in the try block did it not ?, and since i is not local to try, there is no reason why the initial value of i be maintained.
PLs explain
jui

[Hanna Habashy]

hi Jui:
The <if statement> will throw ArthimeticException, so that the body of <if statement> will not be excuted. Then <the catch block> will be excuted printing "Arthimetic Exception cought". After that, the <println statement> will be excuted printing the value of <i>, which has not been changed. If <if statement> wouldn't throw an exception, then the value of <i> would have been changed, and then the catch block would not have been excuted.
I hope that will help
Hanna

[Priyanka Chopda]

Jui,
in this case line
if((i/=(int)Math.floor(Math.random())) > 1)
is thrwoing an exception and when it happens that line won't get evaluated. So value of i is never changing and what getting printed is 2 (declared in line 3. i.e. int i = 2 which is instance variable and have class scope.
-PC

[Dhanashree Mankar]

Originally posted by Jui Mahajan:
public class Question16 {
public static void main(String[] args) {
int i = 2;
try {
if((i/=(int)Math.floor(Math.random())) > 1)
System.out.println("No arithmetic exception");
} catch (ArithmeticException ae){
System.err.println("Arithmetic exception caught");
}
System.out.println(i);
}
}
the ans is iis 2.
my question is. why is the value of i printed as 2, the value of i got changed in the try block did it not ?, and since i is not local to try, there is no reason why the initial value of i be maintained.
PLs explain
jui

---------------------------------------------------------------------------
Value of i is not getting changed. After solving
(int)Math.floor(Math.random())
we are getting 0
Now i/=0 will result into ArithmaticException which will be caught.And so value of i remains 2

[Jui Mahajan]

Thank u all. Just wanted to know what mock exams you guys think r important and what methods do we have to study for collection classes? The Kathy-sierra book does not mention any methods for colection classes.