@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Client client = (Client) o;

        if (id != client.id) return false;
        if (!firstName.equals(client.firstName)) return false;
        if (!lastName.equals(client.lastName)) return false;

        return true;
    }