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Exam 1z0-808 topic 1 question 121 discussion

Actual exam question from Oracle's 1z0-808
Question #: 121
Topic #: 1
[All 1z0-808 Questions]

Given the code fragments:

And:

Which statement is true?

  • A. After line 11, three objects are eligible for garbage collection.
  • B. After line 11, two objects are eligible for garbage collection.
  • C. After line 11, one object is eligible for garbage collection.
  • D. After line 11, none of the objects are eligible for garbage collection.
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Suggested Answer: C 🗳️
by hemassridhar at Jan. 4, 2020, 2:51 p.m.

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Harid
Highly Voted 4 years, 1 month ago
after line 11, nobody referencing to s1, thus makes s1 gc eligible. Even though s2 is null, it is not eligible for gc, because s3 still pointing to it. S3 is not eligible for gc because s1 is pointing to it. Only object that nobody pointing to is S1. After line 11 only one object is eligible for GC = S1.
upvoted 15 times
JongHwa
2 years, 11 months ago
No. s1, s2, s3 are just variable that has Object's reference value(=address value). they are not Object. you said "nobody referencing to s1". that's incorrect. -> "Nobody is referencing the object that s1 initially had." is correct.
upvoted 2 times
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hemassridhar
Highly Voted 4 years, 9 months ago
Correct, object created at line num 6 will be eligible for GC.
upvoted 5 times
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abhayshitole
Most Recent 1 month, 2 weeks ago
Selected Answer: B
Only the object refered by s2 is lost. at line 9 s1 original referenced object is gone. it points to s3. at line 10 s3 original referenced object is gone. it points to s2 at line 11 s2 original referenced object is gone. it point to null. s2 is garbage collected. where as s3 and s1 are still referencing valid objects in memory
upvoted 1 times
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yyfabc
1 year, 6 months ago
tested, 2 objects are still referenced. public static void main(String[] args) { Object w1 = new Object(); Object w2 = new Object(); Object w3 = new Object(); w1 = w3; w3 = w2; w2 = null; System.out.println(w1); System.out.println(w2); System.out.println(w3); }
upvoted 1 times
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RAADEL3IMLAK
1 year, 8 months ago
answer c is correct, tow objet is référenced
upvoted 1 times
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akbiyik
1 year, 10 months ago
Selected Answer: C
Answer is C
upvoted 1 times
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carloswork
1 year, 11 months ago
Selected Answer: C
For those who want an explanation, follow one from stackoverflow: https://stackoverflow.com/questions/68313719/java-object-garbage-collection
upvoted 1 times
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iSnover
2 years ago
Selected Answer: A
The correct answer is the letter A, the reason is that the 3 variables are local variables, so their scope is inside the main method, after line 11 it leaves the main method and the 3 variables lose their usability because they leave their scope , so all 3 are eligible to enter the Garbage collector.
upvoted 1 times
ludaka
7 months, 2 weeks ago
Good point, but I think that your answer applies after line 12.
upvoted 1 times
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archer1903
2 years, 4 months ago
Selected Answer: C
Answer is C
upvoted 1 times
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biggeek123
2 years, 9 months ago
the answer is A after line 11 all are unreferenced
upvoted 1 times
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brianhuang881215
3 years, 1 month ago
obviously,ans is C s2 in its heap area is null, so it is eligible for garbage collection
upvoted 2 times
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bshailesh3
4 years, 8 months ago
Answer B is correct, as after assignment of null two references are still pointing. Tested.
upvoted 3 times
krkpnr
4 years, 7 months ago
and that means correct aswer is C.
upvoted 9 times
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C (25%)
B (20%)
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