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I really do mean identity-equality here.
For example, will the following always print true?
System.out.println("foo".getClass() == "fum".getClass());
Yes, class tokens are unique (for any given classloader, that is).
I.e. you will always get a reference to the same physical object within the same classloader realm. However, a different classloader will load a different class token, in conjunction with the fact that the same class definition is deemed different when loaded by two distinct classloaders.
See this earlier answer of mine for a demonstration of this.