@Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Contact other = (Contact) obj;
        if (!Objects.equals(this.firstName, other.firstName)) {
            return false;
        }
        if (!Objects.equals(this.lastName, other.lastName)) {
            return false;
        }
        if (!Objects.equals(this.address, other.address)) {
            return false;
        }
        if (!Objects.equals(this.city, other.city)) {
            return false;
        }
        if (!Objects.equals(this.state, other.state)) {
            return false;
        }
        if (!Objects.equals(this.zip, other.zip)) {
            return false;
        }
        return true;
    }