how do I correctly override equals for inheritance in java?

Question

I am using hibernate and id... is used for persistence (which is why it is omitted in comparison). (Also, using google guava helper equals)

HolidayPackageVariant:

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Answer 1

Following the Secret of Equals:

HolidayPackageVariant:

public abstract class HolidayPackageVariant {
    private Integer idHolidayPackageVariant;
    private HolidayPackage holidayPackage;
    private String typeHolidayPackage;

    @Override
    public boolean equals(Object obj) {
        if (obj == this) return true;
        if(obj == null) return false;

        if (getClass().equals(obj.getClass())) {
            final HolidayPackageVariant otherPackageVariant = (HolidayPackageVariant) obj;
            return Objects.equal(getTypeHolidayPackage(),otherPackageVariant.getTypeHolidayPackage())
                    && Objects.equal(getHolidayPackage(),
                            otherPackageVariant.getHolidayPackage());
        }
        return false;
    }
}

---

FlightHolidayPackageVariant:

public final class FlightHolidayPackageVariant extends HolidayPackageVariant{
    private Destination originCity;

    @Override
    public boolean equals(Object obj) {

        if(super.equals(obj)){
            return Objects.equal(getOriginCity(),
                    ((FlightHolidayPackageVariant)(obj)).getOriginCity());
        }
        return false;
    }
}

This will ensure that only the same Type of variants are equal to each other.