islands of isolation.....

[Mona Gadkari]

Hello,
I have gone through this topic many times in K&B's book, but each time i end-up with confusion. Pls can anyone out there throw some light on this topic.
This is from the test in the book which i wasn't able to understand.
1> objects with atleast one refrence will never be garbage collected. - i thought this stmt should be true - but it is not - explaination island of isolation.
2> If ob1 refers to ob2, then ob2 can't be garbage collected - this stmt is not true - again the same reason.
Please these island of isolation --- will now isolate me if i don't get to understand them.

[Aleksandar Stojanovic]

Hello Mona
I will try to throw some light on your questions.
Imagine situation that you have obj1 and obj2 and that obj1 refers
to obj2, the same situation as in your question 2 OK, but now pay
attention, imagine that obj1 is no longer in use and is not
referenced by any object at all, what will happen with obj2 ?
( it will become eligible for garbige collection as obj1 too. )
The same situation for question 1.
I hope that i've helped you to better understand
garbige collection topic.