Not sure if the answer provided is correct.
It assumes that the user has overridden the hashcode and equals method correctly.
About Question enthuware.ocpjp.v7.2.1515 :
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Re: About Question enthuware.ocpjp.v7.2.1515 :
This is a general statement about equals and hashCode contract. Even so, the problem statement does contain thisat the bottom, "(Assume that the equals and hashCode contract is not violated by the class.)".\
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