@Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((getId() == null) ? 0 : getId().hashCode());
        result = prime * result + ((getName() == null) ? 0 : getName().hashCode());
        result = prime * result + ((getAge() == null) ? 0 : getAge().hashCode());
        result = prime * result + ((getBirthday() == null) ? 0 : getBirthday().hashCode());
        return result;
    }