queryBuf.append('&');
                queryBuf.append(URLUtil.encode(entry.getValue(), Constants.UTF_8));
                queryBuf.append('=');
                queryBuf.append(URLUtil.encode(entry.getKey(), Constants.UTF_8));
                formBuf.append("<input type=\"hidden\" name=\"");
                formBuf.append(StringEscapeUtils.escapeHtml4(entry.getValue()));

                if (list.isNotEmpty()) {
                    append("  $name (").append(list.size).append(")\n")
                    append(list.joinToString(separator = "\n    ", prefix = "    ", postfix = "\n"))
                }
            }
        }.toString()

Here, the `shutdown` event handler function will write a text line `"Application shutdown"` to a file `log.txt`.

/// info

In the `open()` function, the `mode="a"` means "append", so, the line will be added after whatever is on that file, without overwriting the previous contents.

///

/// tip

        break;
      }
      builder.append(template.substring(templateStart, placeholderStart));
      builder.append(args[i++]);
      templateStart = placeholderStart + 2;
    }
    builder.append(template.substring(templateStart));

    // if we run out of placeholders, append the extra args in square braces
    if (i < args.length) {
      builder.append(" [");
      builder.append(args[i++]);
      while (i < args.length) {

      }
      throw new AssertionError();
    }

    @Override
    void describeAsLowerBound(StringBuilder sb) {
      sb.append('[').append(endpoint);
    }

    @Override
    void describeAsUpperBound(StringBuilder sb) {
      sb.append(endpoint).append(')');
    }

    @Override
    C leastValueAbove(DiscreteDomain<C> domain) {
      return endpoint;
    }

    @Override

        final StringBuilder buf = new StringBuilder(100);
        buf.append(methodName).append("(");
        if (argTypes != null && argTypes.length > 0) {
            for (final Class<?> argType : argTypes) {
                buf.append(argType.getName()).append(", ");
            }
            buf.setLength(buf.length() - 2);
        }
        buf.append(")");
        return new String(buf);
    }

    /**

	o = append(o, 0xa3, 0x72, 0x73, 0x74)
	o = msgp.AppendInt(o, int(z.ResyncStatus))
	// string "fs"
	o = append(o, 0xa2, 0x66, 0x73)
	o = msgp.AppendInt64(o, z.FailedSize)
	// string "frc"
	o = append(o, 0xa3, 0x66, 0x72, 0x63)
	o = msgp.AppendInt64(o, z.FailedCount)
	// string "rs"
	o = append(o, 0xa2, 0x72, 0x73)
	o = msgp.AppendInt64(o, z.ReplicatedSize)
	// string "rrc"

            block = (bytes[i] & 0xff) << 4;
            buffer.append(ALPHABET.charAt(block >>> 6));
            buffer.append(ALPHABET.charAt(block & 0x3f));
            buffer.append("==");
            return buffer.toString();
        }
        block = ((bytes[i++] & 0xff) << 8 | bytes[i] & 0xff) << 2;
        buffer.append(ALPHABET.charAt(block >>> 12));
        buffer.append(ALPHABET.charAt(block >>> 6 & 0x3f));

  @JvmField val message: String,
) {
  override fun toString(): String =
    buildString {
      if (protocol == Protocol.HTTP_1_0) {
        append("HTTP/1.0")
      } else {
        append("HTTP/1.1")
      }
      append(' ').append(code)
      append(' ').append(message)
    }

  companion object {
    fun get(response: Response): StatusLine = StatusLine(response.protocol, response.code, response.message)

        final StringBuilder buf = new StringBuilder(100);
        buf.append(seed).append(CACHE_KEY_SPLITTER);
        stream(tags).of(stream -> stream.sorted().reduce((l, r) -> l + r).ifPresent(v -> buf.append(v)));
        buf.append(CACHE_KEY_SPLITTER);
        stream(roles).of(stream -> stream.sorted().reduce((l, r) -> l + r).ifPresent(v -> buf.append(v)));
        buf.append(CACHE_KEY_SPLITTER);