how to update text ads FinalUrls

I want to update ads finalUrls , Here is code : 

AdGroupAdServiceInterface adGroupAdService = adWordsServices.get(session, AdGroupAdServiceInterface.class);

Ad ad = new Ad();

ad.setId(adId);

ad.setFinalUrls(new String[]{ http://www.example.com/ });

AdGroupAd adGroupAd = new AdGroupAd();

adGroupAd.setAdGroupId(adGroupId);

adGroupAd.setAd(ad);

adGroupAd.setStatus(AdGroupAdStatus.ENABLED);

AdGroupAdOperation operation = new AdGroupAdOperation();

operation.setOperand(adGroupAd);

operation.setOperator(Operator.SET);

AdGroupAdOperation[] operations = new AdGroupAdOperation[] {operation};

AdGroupAdReturnValue result = adGroupAdService.mutate(operations);

There is no error in the result , Is it a success ?

But ads 

FinalUrls no update , Why ?

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