Only classes have methods.
"Threads don't have methods."
"If you instantiate an object in a method it is local to the method."
"If you want to get rid of the object, find all the variables that hold a reference to it, and either null them out or set them to something else."
If there is no explicit reference then of course you can not null it. The gc will just get rid of it with no action from you.
did I undestand correctly that they CANNOT BE UNLOADED?