code: public void addApplicationClass(XClass appXClass) {
          for (XMethod m : appXClass.getXMethods()) {
              if (m.isStub()) {
                  return;
              }
          }
          ClassVertex vertex = addClassAndGetClassVertex(appXClass);
          vertex.markAsApplicationClass();
  
      }
docs: Add an application class, and its transitive supertypes, to the
  inheritance graph.
  
  @param appXClass
  application XClass to add to the inheritance graph