Which objs are eligible for GC?

[Firas Zuriekat]

1. class X {
2. static long story;
3. public static void main(String [] args) {
4. if(story==0) {
5. Long tale = 343L;
6. story = go(tale);
7. }
8. // do stuff
9. System.out.print(story);
10. }
11. static long go(Long t) { return t++; }
12. }


Which is true?


A) The output is 344.
B) Compilation fails due to an error at line 5 or Line 11.
C) At line 8, an object which tale refers tois eligible for garbage collection.
D) At Line 11, two objects eligible for garbage collection.
E) At Line 8 two objects eligible for garbage collection.

ANSWER C

Why isn't the answer A since there is a print statement?
Also, why not D since the method also uses Integer just as line 8?

[Naseem Khan]

Originally posted by Firas Zureikat

Why isn't the answer A since there is a print statement?
Also, why not D since the method also uses Integer just as line 8?

At line--->>> return t++;

It increments it by 1. Again the value of the expression t++ is 343. So A is not correct.

Answer D is not correct since Two references are pointing to the same object. t is also pointing to the same tale Long object.

regards

Naseem Khan

[wise owen]

Answer D is not correct since Two references are pointing to the same object. t is also pointing to the same tale Long object

"t++" will create a new instance of Long. After line 11, this one will eligible for garbage collection.

[Balaji Sampath]

Hi there
When i happen to run the following code i got the output has

Intial value----> 0

Final Value ---->343

public class X{
static long story;
public static void main(String[] args){
System.out.print("Initial Value"+story);
if(story==0) {
long tale = 343L;
story = go(tale);
}
System.out.print("Final Value"+story);
}
static long go(long t) { 
return t++;
}
 
}

Let me know if this is what u need..

Thanks
Balaji.S

[Firas Zuriekat]

Thank you all but how come the t in return t++ was assigned and then incremented. I though it gets incremented after the statement:

retun t++;

And then since we have another statement (the assignement statement) we are guaranteed it's now 344 making the answer A according to this (which is wrong but I don't know why).
[ June 13, 2006: Message edited by: Firas Zureikat ]

[wise owen]

PostIncrementOperatorAndAssignment in JavaRanch.


You can think "return t++;" roughly translates to


Long oldValue = t;
t = t + 1;
return oldValue;

[Firas Zuriekat]

Got it...

It's just breaking that short return statement makes sense...The value is returned before it was really incremented.