why String in java does not override readObject?

I was studying effective java and In immutability(Item 15) it is written that: Make defensive copies (Item 39) in constructors, accessors, and readObject methods (Item 76).

And In Item 76 It is advised to override readObject and create a defensive copy of the mutable object by compromising final keyword. So i checked the String class in java and check whether they have done the same for final char value[]; but readObject is not overridden.

I am confused about this ? Please if answer.

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