@Override
    protected void applyFix(@NotNull Project project, @NotNull PsiElement extendClassIdentifier, @NotNull ModPsiUpdater updater) {
      final PsiClass element = (PsiClass)extendClassIdentifier.getParent();
      if (element == null) {
        return;
      }
      final PsiReferenceList extendsList = element.getExtendsList();
      if (extendsList == null) {
        return;
      }
      final PsiJavaCodeReferenceElement[] referenceElements = extendsList.getReferenceElements();
      for (PsiJavaCodeReferenceElement referenceElement :
        referenceElements) {
        referenceElement.delete();
      }
    }
@Override
    protected void applyFix(@NotNull Project project, @NotNull PsiElement extendClassIdentifier, @NotNull ModPsiUpdater updater)