code: private void generateClassFiles(ClassTree classtree) throws DocletException {
          SortedSet<PackageElement> packages = configuration.typeElementCatalog.packages();
          for (PackageElement pkg : packages) {
              generateClassFiles(configuration.typeElementCatalog.allClasses(pkg), classtree);
          }
      }
docs: Generate the class files for single classes specified on the command line.
  
  @param classtree the data structure representing the class tree
  @throws DocletException if there is a problem while generating the documentation