docs: public static String classNameToSignature(String name) {
          int nameLength = name.length();
          int colonPos = 1 + nameLength;
          char[] buf = new char[colonPos + 1];
          buf[0] = 'L';
          buf[colonPos] = ';';
          name.getChars(0, nameLength, buf, 1);
          for (int i = 1; i != colonPos; ++i) {
              if (buf[i] == '.') {
                  buf[i] = '/';
              }
          }
          return new String(buf, 0, colonPos + 1);
      }