Garbage Collection

[Ektaa Gargg]

Please explain me how should i develop the technique to solve GC questions:
Also at any line in the following code, is a single object eligible for garbage collection n why?

public class Island {
Island n ;
public static void main(String [] args) {
Island i2 = new Island();
Island i3 = new Island();
Island i4 = new Island();

i2.n = i3;
i3.n = i4;
i4.n = i2;

i2 = null;
i3 = null;
i4 = null;
}
}

[Gilles Marceau]

In fact, the key point for garbage collection question is to
remember the following rule :

"An object is eligible for garbage collection when no live thread can access it"

(taken from Sierra&Bates preparation book, thanks to them).
Also remember that you can only say when an object is eligible for garbage
collection, not when the garbage collector run.

With this rule in hand, you can solve the above problem, which is an
example of "island of isolation".