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Greenhorn
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Deck #1, card #22 asks:

and the answer:

However StringBuilder and StringBuffer are final, too:
StringBuffer (Java 8)

StringBuilder (Java 8)

Or there is something I didn't understand?
 
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No. That's wrong. I think we had immutable in mind. Added to the errata list.

In any case, you only have to know that String is final for the exam.
 
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