garbage collection

[santosh prabhat]

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.

[Rohit Ramachandran]

It's zero yeah. But without the Object a=x, it's one. Could we have your source?

[Harikrishna Gorrepati]

0 objects eligible for GC

[ved dixit]

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]

z is not an object. z is a reference varibale -_-;

[Abimaran Kugathasan]

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.