code: public void traverse(String classname, TraversalState state) {
      classname = cleanUp(classname);
      state.getListener().traversing(classname, state.getURL());
    }
docs: Traverses the class, calls the listener available through the state.
  
  @param classname	the classname, automatically removes ".class" and
  turns "/" or "\" into "."
  @param state 	the traversal state