code: public ClassGraph blacklistClasses(final String... classNames) {
          enableClassInfo();
          for (final String className : classNames) {
              if (className.contains("*")) {
                  throw new IllegalArgumentException("Cannot use a glob wildcard here: " + className);
              }
              final String classNameNormalized = WhiteBlackList.normalizePackageOrClassName(className);
              scanSpec.classWhiteBlackList.addToBlacklist(classNameNormalized);
              scanSpec.classfilePathWhiteBlackList
                      .addToBlacklist(WhiteBlackList.classNameToClassfilePath(classNameNormalized));
          }
          return this;
      }
docs: Specifically blacklist one or more specific classes, preventing them from being scanned even if they are in a
  whitelisted package.
  
  <p>
  N.B. Automatically calls {@link #enableClassInfo()}.
  
  @param classNames
  The fully-qualified names of classes to blacklist (using '.' as a separator). May not include a
  glob wildcard ({@code '*'}).
  @return this (for method chaining).