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Thread: Question about Garbage Collector

  1. #1
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    Default Question about Garbage Collector

    Hi guys, first of all I want to apologize for my bad english and I'm not even sure if this is the proprely thread to submit my question.
    That's my question:
    In this code, which one of the 3 objects i1,i2,i3 IS NOT elegible for the Garbage Collection(And why) when the method g() starts:
    class I {
    private I ref;
    private String name;
    public I(String s) {
     name = s;}
    public void referTo ( I i) {
    ref = i;
    }
     
    Class J {
    private I i1 = new I("o1");
    private I i2 = new I ("o2");
    private I i3 = new I ("o3");
    private void f() {
    i1.referTo(i2);
    i2.referTo(i1);
    i3.referTo(i3);
    i3=i1;
    i2=i1;
    g();
    }
    private void g() { }
    public static void main (String[] args) {
    new J().f();
    }
    }

    Options are
    A= o1
    B= o2
    C= o1 and o2
    D= o3
    E= None of the above
    I thank you in advance,
    Greats, Yuri.
    Last edited by Yuri0202; September 12th, 2014 at 01:50 PM.


  2. #2
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    Default Re: Question about Garbage Collector

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    We won't do your homework for you. If you'd like to give us your answer and ask us what we think about it or if you're right, we might give our opinions, but I'm not guaranteeing that either.

    Also posted here.

  3. #3
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    Default Re: Question about Garbage Collector

    You are right.
    This question was on my Java exams, i took A, o1 but I think it may be wrong. I just focussed my attention to this code lines: "i3=i1, i2=1", I haven't studied GC very well, but I seem to remember that if we got two objects , x and y, and we do : x =y, than x loses his referments and he's elegible for the Garbage Collection. So in this case i3=1, i2=1, it seems like i1 is the only object not elegible for GC, and that's why I answered o1. But then I realized, it should have been i1 in the answer(instead of o1?) and still, does the method referTo influences my procediment? Well i guess they do, i don't know why but i think my answer is more likely wrong.

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    Default Re: Question about Garbage Collector

    This thread has been cross posted here:

    http://www.java-forums.org/new-java/92651-question-about-garbage-collector.html

    Although cross posting is allowed, for everyone's benefit, please read:

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  5. The Following User Says Thank You to copeg For This Useful Post:

    Yuri0202 (September 12th, 2014)

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