Part I:
equals() (javadoc) must define an equivalence relation (it must be reflexive, symmetric, and transitive). In addition, it must be consistent (if the objects are not modified, then it must keep returning the same value). Furthermore, o.equals(null) must always return false.equals() (javadoc) must define an equiva
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How to implement equals() and hashCode() methods in Java[reproduced]
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