Java .hashCode()

This is a function that returns an integer corresponding to the hashcode generated by hashing algorithms of Java Objects. Custom hashing algorithms must be created for custom classes.

Example Hashing Algorithm

@Override
public 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;
}