public static String join(List<?> list, String joinString) {
    StringBuilder result = new StringBuilder(80);
    boolean firstTime = true;
    for (Object object : list) {
      if (firstTime) {
        firstTime = false;
      } else {
        result.append(joinString);
      }
      result.append(object);
    }
    return result.toString();
  }
Handles the special cases for {@link #levelToString(int)} including such cases as the
SECURITY_LOGGING_PREFIX and an invalid log level.
geode-core/src/main/java/org/apache/geode/internal/logging/LogWriterImpl.java