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How can I overload equal method to make different objects have same hashcode value in unordered_multimap?

What is the need of overriding hashCode method when overriding equals method?

  • what will happen if we override the hashCode method? I do know that hashCode will be the same for two objects, that means there is only one object in the memory ??? what is the need for XOR operation done on variables of my class during returning hashCode method? PS: If you want any further clarification regarding my question i will add more details.

  • Answer:

    If you want people to do your homework for you, you could at least try to provide more detailed information. For example, the programming language you are concerned with.

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If you want to override equals method in your class, you should also override hashCode method as well. public int hashCode() { final int PRIME = 31; int result = 1; result = PRIME * result + number; return result; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final Scrap other = (Scrap) obj; if (number != other.number) return false; return true; }

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