code: private void generateClassFiles(ClassTree classtree) {
          String[] packageNames = configuration.classDocCatalog.packageNames();
          for (String packageName : packageNames) {
              generateClassFiles(configuration.classDocCatalog.allClasses(
                      packageName), classtree);
          }
      }
docs: Generate the class files for single classes specified on the command line.
  
  @param classtree the data structure representing the class tree.