Garbage collection problem

[Rajesh k Jha]

My question is that after reaching //dostuff
how many objects are eligible for garbage collection

This question is from K&B chap-3
Can somebody explain how this all is happening in detail, as i am a bit confused about garbage
collection, I read a lot but still i am not happy with my knowledge about it

class Dozens{
int[] dz={1,2,3,4,5,6,7,8,9,10,11,12};
}
public class Eggs{
public static void main(String[] args)
{
Dozens[] da=new Dozens[3];
da[0]=new Dozens();
Dozens d=new Dozens();
da[1]=d;
d=null;
da[1]=null;
//do stuff
}
}

[Jesper de Jong]

The same question has been discussed a number of times before:

http://www.coderanch.com/t/456750/Programmer-Certification-SCJP/certification/Number-objects-Array
http://www.coderanch.com/t/454321/Programmer-Certification-SCJP/certification/capitulo-kathy-sierra-book
http://www.coderanch.com/t/442658/Programmer-Certification-SCJP/certification/Help-with-Garbage-Collection
http://www.coderanch.com/t/423210/Programmer-Certification-SCJP/certification/array-GC
http://www.coderanch.com/t/417870/Programmer-Certification-SCJP/certification/Number-Objects-created
http://www.coderanch.com/t/270341/Programmer-Certification-SCJP/certification/K-B-SCJP-Chapter-Q

I found these by searching the forum for the word "Dozens".