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並前往https://stackoverflow.com/questions/72997130/need-to-write-a-equals-method-to-check-if-a-book-is-the-same-as-another-book-but

Need to write a equals-method to check if a book is the same ...

You need "equals(Object o)", not "Book book". See Thilo Schwarz's implementation below. And "==" is wrong for Java string comparison.

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