code: public static boolean implementsZeroArgMethod(ClassNode classNode, String methodName) {
          MethodNode method = classNode.getDeclaredMethod(methodName, Parameter.EMPTY_ARRAY);
          return method != null && (method.isPublic() || method.isProtected()) && !method.isAbstract();
      }
docs: Tests whether the ClasNode implements the specified method name.
  
  @param classNode  The ClassNode
  @param methodName The method name
  @return true if it does implement the method