Hi,
when you explicitly call the destroy method, the container executes it and makes the servlet instance to be Garbage collected.
regarding the finalize method, it is called when the servlet is about to be garbage collection. Agian the GC is not sure to be called everytime.When the resources are low GC
thread will be called by the JVM.
So the Destroy method doesn't have any realtion with the Finalize method.
Usually Destroy methos is used to release some resources like, Database connections, network connections, files and so on.
Cheers.