docs: public String getFullyQualifiedClassName() {
          if (fullyQualifiedClassName == null) {
              final StringBuilder buf = new StringBuilder();
              buf.append(className);
              for (final String suffix : suffixes) {
                  buf.append('$');
                  buf.append(suffix);
              }
              fullyQualifiedClassName = buf.toString();
          }
          return fullyQualifiedClassName;
      }