garbage collector exaple

At what point will the object created on line 8 be eligible for garbage collection?

public class RJMould{
    StringBuffer sb;
    public static void main(String argv[]){
   RJMould rjm = new RJMould();
   rjm.kansas();
   }
    public void kansas(){
   sb = new StringBuffer("Manchester");
   StringBuffer sb2 = sb;
   StringBuffer sb3 = new StringBuffer("Chester");
   sb=sb3;
   sb3=null;
   sb2=null;
    }
}


1) Line 11
2) Line 9
3) Line 12
4) Line 13

I was trying above example from link
http://www.jchq.net/certkey/0301certkey.htm

did not understand THE ANSWER.It said line 13. I was thinking line 11 as that particular line sb is assigned to  sb3.

I was trying to understand the answer.


 Any links, ideas, resources,sample code highly appreciated. thanks in advance.








Which of the following statements are true?

1) finalize will always run before an object is garbage collected
2) finalize may run before or after an object is garbage collected
3) finalize will run when an object becomes unreachable
4) finalize allows a programmer to free memory allocated to an object

Finalize will always be run before an object is garbage collected. It cannot run after it is collected because by then the object will cease to exit. When an object becomes unreachable it will be eligible for garbage collection but there is no guarantee when finalize will run, only that it will run before garbage collection happens. The final option is a passable description of destructors in C++ but not of the finalize method in Java.