garbage Collection

[suresh seeram]

Hello every body,
This question is from Mughal..
Select valid answers..
1. If object obj1 is accessible from object obj2 and object obj2 is accessible from obj1, then obj1 and obj2 are not eligible for garbage collection //false
2. IF an object obj1 can access an object obj2 that is eligible for garbage collection, then obj1 also eligible for garbage collection..//true
Can any body expalin.. these two statements with proper examples..
I am not getting real picture.. please explain with good examples..

Fast reply will be appreciated..
thanks in advance
regards,
Suresh

[Valentin Crettaz]

1. two objects may reference themselves but still be eligible for garbage collection because they may not be reachable from any active part of the program
2. if obj2 is eligible for garbage collection that means that obj2 is not reachable from any active part of the program. This also means that obj1 is not an "active part" of the program and thus must also be eligible for garbage collection.
Moreover, the following article explains the concepts. Read it carefully, it helped a lot in understanding garbage collection
Reference Objects and Garbage Collection
HIH

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Valentin Crettaz
Sun Certified Programmer for Java 2 Platform