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garbage collection

 
Greenhorn
Posts: 4
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How many objects are eligible for garbage collection after executing line 7?

public class Tester {

public static void main(String[] args) {

Integer x = new Integer(3000);
Integer y = new Integer(4000);
Integer z = new Integer(5000);

Object a = x;
x = y;
y = z;
z = null; //line 7
}
}

1) 0
2) 1
3) 2
4) 3

i think it should be 0 ie first option bt its right option was 1 how it will be please someone answer it.
 
Ranch Hand
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It's zero yeah. But without the Object a=x, it's one. Could we have your source?
 
Ranch Hand
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0 objects eligible for GC
 
Greenhorn
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I think, the Answer is 1. Only 'z' will be eligible for GC !!

x, y, & a links to same number, while only z is linking to null at the end.
So only z will be eligible for GC !!

Just draw a diagram, that way it will be very easy to understand !!

Thanks,
Ved
 
Rohit Ramachandran
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z is not an object. z is a reference varibale -_-;
 
Ranch Hand
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santosh prabhat, please UseCodeTags when you post a code snaps! Use the EDIT button to edit it and insert the code tags!

There are no objects eligible for GC. And, further, GC isn't for reference variables. It's for objects.
 
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