*/
    public static void appendHex(final StringBuilder buf, final int i) {
        buf.append(Integer.toHexString(i >> 24 & 0xff));
        buf.append(Integer.toHexString(i >> 16 & 0xff));
        buf.append(Integer.toHexString(i >> 8 & 0xff));
        buf.append(Integer.toHexString(i & 0xff));
    }

    /**
     * Converts an underscore-separated string to camel case.
     * <p>

    //                                                                      ==============
    @Override
    public String toString() {
        final String hash = Integer.toHexString(hashCode());
        return DfTypeUtil.toClassTitle(this) + ":{acceptCookieLocale=" + isAcceptCookieLocale() + "}@" + hash;
    }

      if (ch == '\t' || ch == '\n' || ch == '\r') {
        // Only these whitespace chars are permitted in XML,
        if (shouldEscapeWhitespaceChars) {
          assertEscaping(xmlEscaper, "&#x" + Integer.toHexString(ch).toUpperCase() + ";", ch);
        } else {
          assertUnescaped(xmlEscaper, ch);
        }
      } else {
        // and everything else is replaced with FFFD.
        assertEscaping(xmlEscaper, "\uFFFD", ch);

    public int instanceHash() {
        return super.hashCode();
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + ":" + doBuildColumnString(", ") + "@" + Integer.toHexString(hashCode());
    }

    protected abstract String doBuildColumnString(String dm);

    @Override
    public String toStringWithRelation() { // #pending
        return toString();
    }

    }
  }

  @J2ktIncompatible // hexadecimal doubles
  @GwtIncompatible // Doubles.tryParse
  public void testTryParseOfToHexStringIsOriginal() {
    for (double d : NUMBERS) {
      checkTryParse(d, Double.toHexString(d));
    }
  }

  @GwtIncompatible // Doubles.tryParse
  public void testTryParseNaN() {
    checkTryParse("NaN");
    checkTryParse("+NaN");
    checkTryParse("-NaN");
  }