return "GnuDSAPublicKey: y=" + y.toString(16) + " p=" + p.toString(16) + " q=" + q.toString(16) + " g=" + g.toString(16);
return "GnuDSAPublicKey: y=" + (y != null ? y.toString(16) : "(null)") + " p=" + (p != null ? p.toString(16) : "(null)") + " q=" + (q != null ? q.toString(16) : "(null)") + " g=" + (g != null ? g.toString(16) : "(null)");
  public String toString()  {    return "GnuDSAPublicKey: y=" + y.toString(16) + " p=" + p.toString(16)      + " q=" + q.toString(16) + " g=" + g.toString(16);  }