Check out example codes for "java hashcode". It will help you in understanding the concepts better.

Code Example 1

@Overridepublic int hashCode() {    int hash = 7;    hash = 31 * hash + (int) id;    hash = 31 * hash + (name == null ? 0 : name.hashCode());    hash = 31 * hash + (email == null ? 0 : email.hashCode());    return hash;}

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