code: public SortedSet<TypeElement> allUnnamedClasses() {
          for (PackageElement pkg : allClasses.keySet()) {
              if (pkg.isUnnamed()) {
                  return allClasses.get(pkg);
              }
          }
          return new TreeSet<>(comparator);
      }
docs: Return all of the classes specified on the command-line that belong to the given package.
  
  @param packageName the name of the package specified on the command-line.