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There is a point in general contract of equals method, which says if You has defined equals() method then You should also define hashCode() method. And if o1.equals(o2) then this is must o1.hashCode() == o2.hashCode().
So my question is what if I break this contract? Where can bring fails the situation when o1.equals(o2) but o1.hashCode != o2.hashCode() ?
It will lead to unexpected behavior in hash based data structure for example:
HashMap, Read how HashTable works